Step1
In the United States, impeachment can occur both at the federal and state level. At the federal level, different standards apply when the impeachment involves a member of the executive branch or of the judiciary (and dispute currently exists over the use of impeachment against members of the legislative branch.) For the executive branch, only those who have allegedly committed "treason, bribery, or other high crimes and misdemeanors" may be impeached. Although treason and bribery are obvious, the Constitution is silent on what constitutes a "high crime or misdemeanor." Several commentators have suggested that Congress alone may decide for itself what constitutes an impeachable offense. In 1970, then-Representative Gerald R. Ford defined the criteria as he saw it: "An impeachable offense is whatever a majority of the House of Representatives considers it to be at a given moment in history." Four years later, Ford would assume the Presidency, following a vote to approve impeachment proceedings against Richard Nixon (who ultimately resigned prior to being impeached).
The standard for impeachment among the judiciary is much broader. Article III of the Constitution states that judges remain in office "during good behavior," implying that Congress may remove a judge for bad behavior. The standard for impeachment of members of the legislature is/would be the same as the Executive standard, "treason, bribery, or other high crimes and misdemeanors."
The central question regarding the Constitutional dispute about the impeachment of members of the legislature is this: Are members of Congress "officers" of the United States? The Constitution grants to the House the power to impeach "The President, the Vice President, and all civil Officers of the United States." Many believe firmly that Members of Congress are not "officers of the United States."Source (pdf) (Navigate to page 7) Many others, however, believe that Members are civil Officers and are subject to impeachment. The House of Representatives did impeach a Senator once, Senator William Blount. The Senate expelled Senator Blount and, after initially hearing his impeachment, dismissed the charges for lack of jurisdiction. Left unsettled was the question "Are members of Congress civil officers of the United States?" In modern times, expulsion has become the preferred (albeit rare) method of dealing with errant Members of Congress, as each House has the authority to expel their own members—without involving t