Final answer:
An impeachable offense may include abuse of power, treason, bribery, or other high crimes and misdemeanors. Impeachment involves charges in the House and a Senate trial, where a two-thirds vote is needed for removal. No president has been removed from office through this process, although Presidents Andrew Johnson, Richard Nixon, Bill Clinton, and Donald Trump faced impeachment proceedings.
Step-by-step explanation:
Based on the four points regarding impeachable offenses, actions such as abuse of power, treason, bribery, or committing "other high crimes and misdemeanors" might constitute an impeachable offense. Impeachment is a tool that provides a check against the possibility of a government official, including the President, acting against the constraints of their authority.
Impeachment proceedings begin in the House of Representatives with the drafting and passage of articles of impeachment by a simple majority. Upon a successful impeachment in the House, the case moves to the Senate for a trial, where a two-thirds majority is required to convict and remove an official from office. High crimes and misdemeanors is a constitutionally broad term that embraces a wide range of conduct. Presidents Andrew Johnson and Bill Clinton were impeached but acquitted by the Senate. Richard Nixon resigned before impeachment, and Donald Trump was impeached twice without being removed.
Impeachment serves as a necessary check, ensuring that no president or civil officer becomes above the law and maintains the principle that all government officials are accountable to the people and the constitution.