"The 25th Amendment, proposed by Congress and ratified by the states in the aftermath of the assassination of President John F. Kennedy, provides the procedures for replacing the president or vice president in the event of death, removal, resignation, or incapacitation...
Section 4.
Whenever the Vice President and a majority of either the principal officers of the executive departments or of such other body as Congress may by law provide, transmit to the President pro tempore of the Senate and the Speaker of the House of Representatives their written declaration that the President is unable to discharge the powers and duties of his office, the Vice President shall immediately assume the powers and duties of the office as Acting President.
Thereafter, when the President transmits to the President pro tempore of the Senate and the Speaker of the House of Representatives his written declaration that no inability exists, he shall resume the powers and duties of his office unless the Vice President and a majority of either the principal officers of the executive department or of such other body as Congress may by law provide, transmit within four days to the President pro tempore of the Senate and the Speaker of the House of Representatives their written declaration that the President is unable to discharge the powers and duties of his office.
Thereupon Congress shall decide the issue, assembling within forty-eight hours for that purpose if not in session.
If the Congress, within twenty-one days after receipt of the latter written declaration, or, if Congress is not in session, within twenty-one days after Congress is required to assemble, determines by two-thirds vote of both Houses that the President is unable to discharge the powers and duties of his office, the Vice President shall continue to discharge the same as Acting President; otherwise, the President shall resume the powers and duties of his office."
https://www.law.cornell.edu/constitution/amendmentxxv
.
.
Annotated List of coups d'état and coup attempts
1605: On November 5, a group of provincial English Catholics led by Guy Fawkes attempted to kill King James I and much of the Protestant aristocracy by blowing up the Houses of Parliament during the State Opening of Parliament.
1648: Pride's Purge - those MPs who wished to continue political negotiations with Charles I were ejected from the House of Commons. Those remaining - known as the Rump - went on to agree that the king should be put on trial for his life.
1653: On 20 April Oliver Cromwell, with forty musketeers under the command of Charles Worsley, entered the House of Commons and forcibly dissolved the Rump Parliament leading to Cromwell becoming Lord Protector and instigating military rule.
1689: Boston Revolt: In an action described by some as a "putsch", the Puritan militia, assisted by a Bostonian mob, arrests Sir Edmund Andros. Andros was the unpopular governor of the Dominion of New England.
1784: Coup by the crown prince Frederick of Denmark against the ruling cabinet led by Ove Høegh-Guldberg.
1794: Coup du 9 Thermidor by members of the Committee of Public Safety against Robespierre.
1797: Coup du 18 Fructidor by the French Directory with the support of the military, against the royalists.
1799: Coup du 18 Brumaire by Napoléon Bonaparte.
1851: the president of France, Louis-Napoléon Bonaparte dissolves the Assembly and becomes the sole ruler of the country. In the following year, he would restore the Empire by referendum.
1876: Aniceto Esquivel Sáenz was President of Costa Rica for a brief period of three months in 1876 before being deposed in a coup d'état led by Vicente Herrera Zeledón.
1893: With the aid of U.S. Marines, U.S. Department of State Minister to the Kingdom of Hawaii, John L. Stevens backs businessmen of native and foreign nationality in a coup that deposes Queen Lili'uokalani.
The Wilmington insurrection of 1898, also known as the Wilmington massacre of 1898 or the Wilmington race riot of 1898, began in Wilmington, North Carolina on November 10, 1898 and continued for several days. It is considered a turning point in Post-Reconstruction North Carolina politics. The event marks an era of more severe racial segregation and effective disenfranchisement of African-Americans throughout the South...
the events are classified by some as a coup d'etat; white Democratic Party insurgents overthrew the legitimately elected local government,[2][3] expelling black leaders from the city. In addition, a mob of nearly 2,000 white men attacked the only black newspaper in the state, and persons and property in black neighborhoods, killing an estimated 15 to more than 60 victims, and destroying homes and businesses built up since the Civil War.
...In 1900, a second "white supremacy" political campaign cemented the Democrats' domination in the state; they elected Charles B. Aycock as governor. Party agitators used photos suggesting "Negro domination" to raise fears and tensions. The crude strategy, plus the constitutional amendment, had sharply reduced African-American voting, and the Democrats controlled the legislature and governor's office.
https://en.wikipedia.org/wiki/Wilmington_insurrection_of_1898
1920; In the Plan of Agua Prieta, General Álvaro Obregón, backed by labor unions and Zapatistas, ousts Mexican President Venustiano Carranza.
1922; Between October 27 and 29, the March on Rome by the Blackshirts led to the installation of Benito Mussolini of the National Fascist Party as prime minister of the Kingdom of Italy, supported by King Victor Emmanuel III. After the election of 1924 and the assassination of Giacomo Matteotti, Mussolini established a dictatorship on January 3, 1925.
1933; The Business Plot against the administration of Franklin D. Roosevelt in the United States is planned, but not carried out due to General Smedley Butler's decision to report it to the authorities.
1939; A coup by military officers and Spanish Socialist Workers' Party members in the Republican zone of Spain results in the formation of the National Council of Defense as a step towards a negotiated peace with the Nationalists. The negotiations eventually fail, but the coup signals the end of the Spanish Civil War.
1943; The 24 July coup to remove Fascist dictator Benito Mussolini as Prime Minister of the Kingdom of Italy and replace him with Marshal Pietro Badoglio; Count Dino Grandi and the Grand Council of Fascism voted overwhelmingly to ask King Victor Emmanuel to resume his full constitutional powers and, on the following day, the King summoned Mussolini to his palace and dismissed him.
1951; Bolivian general Hugo Ballivián establishes a military junta in Bolivia to prevent elected reformist Víctor Paz Estenssoro from taking office.
1953; A joint US/UK coup in Iran, codenamed Operation Ajax, overthrows Prime Minister Mohammed Mosaddeq.
1954; In Guatemala, the democratically elected government of Colonel Jacobo Arbenz Guzmán was ousted by Coronel Carlos Castillo Armas in an operation organized by the American Central Intelligence Agency codenamed Operation PBSUCCESS.[8]
1970; US plans "constitutional coup" to prevent Salvador Allende from assuming power in Chile.
1976; Marshall Ye Jianying and political leader Hua Guofeng stage a coup against the Gang of Four, led by Chairman Mao Zedong's widow, Jiang Qing and leading to the return of Deng Xiaoping and the launch of China's reform era.
1979; Attempted coup in Iran, backed by the US[citation needed] to overthrow Interim government which came to power after the Iranian Revolution.
1991; Russian SFSR leads a successful anti-communist coup d'état allowing the Soviet Union to collapse and establishing the Russian Federation
1993; Russian President Boris Yeltsin successfully launches a self-coup, illegally dissolving the Russian parliament.
https://en.wikipedia.org/wiki/List_of_coups_d'%C3%A9tat_and_coup_attempts
Section 4.
Whenever the Vice President and a majority of either the principal officers of the executive departments or of such other body as Congress may by law provide, transmit to the President pro tempore of the Senate and the Speaker of the House of Representatives their written declaration that the President is unable to discharge the powers and duties of his office, the Vice President shall immediately assume the powers and duties of the office as Acting President.
I don't think it applies at this point,
if the argument is Trump makes stuff up when he speaks or tweets extemporaneously,
but it appears that enough of the President's 'men' can remove him from power
but it appears that enough of the President's 'men' can remove him from power
Thereafter, when the President transmits to the President pro tempore of the Senate and the Speaker of the House of Representatives his written declaration that no inability exists, he shall resume the powers and duties of his office unless the Vice President and a majority of either the principal officers of the executive department or of such other body as Congress may by law provide, transmit within four days to the President pro tempore of the Senate and the Speaker of the House of Representatives their written declaration that the President is unable to discharge the powers and duties of his office.
Pence and a majority of the "executive department"
are way unlikely to pull some siht like that in the near term,
and Congress, both houses would be under siege if they tried it.
Thereupon Congress shall decide the issue, assembling within forty-eight hours for that purpose if not in session.
coup d'état
a sudden decisive exercise of force in politics; especially:
the violent overthrow or alteration of an existing government
by a small group <a military coup d'état of the dictator>
If the Congress, within twenty-one days after receipt of the latter written declaration, or, if Congress is not in session, within twenty-one days after Congress is required to assemble, determines by two-thirds vote of both Houses that the President is unable to discharge the powers and duties of his office, the Vice President shall continue to discharge the same as Acting President; otherwise, the President shall resume the powers and duties of his office."
https://www.law.cornell.edu/constitution/amendmentxxv
.
.
Annotated List of coups d'état and coup attempts
1605: On November 5, a group of provincial English Catholics led by Guy Fawkes attempted to kill King James I and much of the Protestant aristocracy by blowing up the Houses of Parliament during the State Opening of Parliament.
1648: Pride's Purge - those MPs who wished to continue political negotiations with Charles I were ejected from the House of Commons. Those remaining - known as the Rump - went on to agree that the king should be put on trial for his life.
1653: On 20 April Oliver Cromwell, with forty musketeers under the command of Charles Worsley, entered the House of Commons and forcibly dissolved the Rump Parliament leading to Cromwell becoming Lord Protector and instigating military rule.
1689: Boston Revolt: In an action described by some as a "putsch", the Puritan militia, assisted by a Bostonian mob, arrests Sir Edmund Andros. Andros was the unpopular governor of the Dominion of New England.
1784: Coup by the crown prince Frederick of Denmark against the ruling cabinet led by Ove Høegh-Guldberg.
1794: Coup du 9 Thermidor by members of the Committee of Public Safety against Robespierre.
1797: Coup du 18 Fructidor by the French Directory with the support of the military, against the royalists.
1799: Coup du 18 Brumaire by Napoléon Bonaparte.
1851: the president of France, Louis-Napoléon Bonaparte dissolves the Assembly and becomes the sole ruler of the country. In the following year, he would restore the Empire by referendum.
1876: Aniceto Esquivel Sáenz was President of Costa Rica for a brief period of three months in 1876 before being deposed in a coup d'état led by Vicente Herrera Zeledón.
1893: With the aid of U.S. Marines, U.S. Department of State Minister to the Kingdom of Hawaii, John L. Stevens backs businessmen of native and foreign nationality in a coup that deposes Queen Lili'uokalani.
The Wilmington insurrection of 1898, also known as the Wilmington massacre of 1898 or the Wilmington race riot of 1898, began in Wilmington, North Carolina on November 10, 1898 and continued for several days. It is considered a turning point in Post-Reconstruction North Carolina politics. The event marks an era of more severe racial segregation and effective disenfranchisement of African-Americans throughout the South...
the events are classified by some as a coup d'etat; white Democratic Party insurgents overthrew the legitimately elected local government,[2][3] expelling black leaders from the city. In addition, a mob of nearly 2,000 white men attacked the only black newspaper in the state, and persons and property in black neighborhoods, killing an estimated 15 to more than 60 victims, and destroying homes and businesses built up since the Civil War.
...In 1900, a second "white supremacy" political campaign cemented the Democrats' domination in the state; they elected Charles B. Aycock as governor. Party agitators used photos suggesting "Negro domination" to raise fears and tensions. The crude strategy, plus the constitutional amendment, had sharply reduced African-American voting, and the Democrats controlled the legislature and governor's office.
https://en.wikipedia.org/wiki/Wilmington_insurrection_of_1898
1920; In the Plan of Agua Prieta, General Álvaro Obregón, backed by labor unions and Zapatistas, ousts Mexican President Venustiano Carranza.
1922; Between October 27 and 29, the March on Rome by the Blackshirts led to the installation of Benito Mussolini of the National Fascist Party as prime minister of the Kingdom of Italy, supported by King Victor Emmanuel III. After the election of 1924 and the assassination of Giacomo Matteotti, Mussolini established a dictatorship on January 3, 1925.
1933; The Business Plot against the administration of Franklin D. Roosevelt in the United States is planned, but not carried out due to General Smedley Butler's decision to report it to the authorities.
1939; A coup by military officers and Spanish Socialist Workers' Party members in the Republican zone of Spain results in the formation of the National Council of Defense as a step towards a negotiated peace with the Nationalists. The negotiations eventually fail, but the coup signals the end of the Spanish Civil War.
1943; The 24 July coup to remove Fascist dictator Benito Mussolini as Prime Minister of the Kingdom of Italy and replace him with Marshal Pietro Badoglio; Count Dino Grandi and the Grand Council of Fascism voted overwhelmingly to ask King Victor Emmanuel to resume his full constitutional powers and, on the following day, the King summoned Mussolini to his palace and dismissed him.
1951; Bolivian general Hugo Ballivián establishes a military junta in Bolivia to prevent elected reformist Víctor Paz Estenssoro from taking office.
1953; A joint US/UK coup in Iran, codenamed Operation Ajax, overthrows Prime Minister Mohammed Mosaddeq.
1954; In Guatemala, the democratically elected government of Colonel Jacobo Arbenz Guzmán was ousted by Coronel Carlos Castillo Armas in an operation organized by the American Central Intelligence Agency codenamed Operation PBSUCCESS.[8]
1970; US plans "constitutional coup" to prevent Salvador Allende from assuming power in Chile.
1976; Marshall Ye Jianying and political leader Hua Guofeng stage a coup against the Gang of Four, led by Chairman Mao Zedong's widow, Jiang Qing and leading to the return of Deng Xiaoping and the launch of China's reform era.
1979; Attempted coup in Iran, backed by the US[citation needed] to overthrow Interim government which came to power after the Iranian Revolution.
1991; Russian SFSR leads a successful anti-communist coup d'état allowing the Soviet Union to collapse and establishing the Russian Federation
1993; Russian President Boris Yeltsin successfully launches a self-coup, illegally dissolving the Russian parliament.
https://en.wikipedia.org/wiki/List_of_coups_d'%C3%A9tat_and_coup_attempts