According to the Constitution, the President, the Vice President and all civil officers can be removed from office by impeachment and conviction. The House of Representatives brings impeachment (charges) and the Senate then has the sole right to judge the accused. Conviction requires a two-thirds majority of the Senate. The Chief Justice of the Supreme Court presides over the Senate when a President is impeached.
The Congress has impeached Presidents twice . Preisident ohnson and President Clinton. In both cases the House of Representatives impeached but the Senate did not convict, thus the President remained in office.