It sounds like your asking the question from the perspective of someone with a parliamentary system where the prime minister is chosen by the majority party or coalition. That is not the case in the U.S., the president is elected completely independently from our legislators.
While there is a provision to remove the president due to incapacitation, and there has been talk of applying that to Trump’s mental decline, the bar is high. The vice president and a majority of the cabinet (which were chosen by, and serve at the pleasure of, the president) have to petition Congress and if the president says no disability exists both houses of Congress have to agree by a 2/3 vote to remove him for disability.
The more likely route is impeachment, but this is also a high bar. A simple majority in the House of Representatives impeaches the president, but that just means sending him to the Senate for trial where a 2/3 majority is required to convict and remove him.
It sounds like your asking the question from the perspective of someone with a parliamentary system where the prime minister is chosen by the majority party or coalition. That is not the case in the U.S., the president is elected completely independently from our legislators.
While there is a provision to remove the president due to incapacitation, and there has been talk of applying that to Trump’s mental decline, the bar is high. The vice president and a majority of the cabinet (which were chosen by, and serve at the pleasure of, the president) have to petition Congress and if the president says no disability exists both houses of Congress have to agree by a 2/3 vote to remove him for disability.
The more likely route is impeachment, but this is also a high bar. A simple majority in the House of Representatives impeaches the president, but that just means sending him to the Senate for trial where a 2/3 majority is required to convict and remove him.
Don’t hold your breath for it.