Here's this info as well:
The impeachment trial of President Bill Clinton
in 1999, Chief Justice William H. Rehnquist
presiding. The House managers are seated beside the quarter-circular tables on the left and the president's personal counsel on the right, much in the fashion of President Andrew Johnson's trial.
Similar to the British system, Article One of the United States Constitution give the House of Representatives the sole power of impeachment and the Senate the sole power to try convictions. Unlike the British system, conviction requires a two-thirds vote.
 Impeachable offenses
In the United States, impeachment can occur both at the federal and state level. The Constitution defines impeachment at the federal level and limits impeachment to "The President, Vice President, and all civil officers of the United States" who may only be impeached and removed for "treason, bribery, or other high crimes and misdemeanors".  Several commentators have suggested that Congress alone may decide for itself what constitutes an impeachable offense. In 1970, then-House Minority Leader 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 become president when President Richard Nixon resigned under the threat of impeachment.
Article III of the Constitution states that judges remain in office "during good behaviour", implying that Congress may remove a judge for bad behavior via impeachment. Whether this is the only method available to remove judges is a subject of controversy. The House has impeached 13 federal judges and the Senate has convicted six of them.
 Officials subject to impeachment
The central question regarding the Constitutional dispute about the impeachment of members of the legislature is whether members of Congress are "officers" of the United States. The Constitution grants 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. 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 whether members of Congress were civil officers of the United States. The House has never impeached a member of Congress since Blount. As each House has the authority to expel its own members without involving the other chamber, expulsion has been the method used for removing Members of Congress.
Jefferson's Manual, which is integral to the House rules, states that impeachment is set in motion by charges made on the floor, charges preferred by a memorial, a member's resolution referred to a committee, a message from the president, charges transmitted from the legislature of a state or territory or from a grand jury, or from facts developed and reported by an investigating committee of the House. It further states that a proposition to impeach is a question of high privilege in the House and at once supersedes business otherwise in order under the rules governing the order of business.
The impeachment process is a two-step procedure. The House of Representatives must first pass by a simple majority articles of impeachment, which constitute the formal allegation or allegations. Upon their passage, the defendant has been "impeached". Next, the Senate tries the accused. In the case of the impeachment of a president, the Chief Justice of the United States presides over the proceedings. This may include the impeachment of the vice president, although legal theories suggest that allowing a person to be the judge in the case where she or he was the defendant would be a blatant conflict of interest. If the Vice President did not preside over an impeachment (of someone other than the President), the duties would fall to the President pro tempore of the Senate.
In order to convict the accused, a two-thirds majority of the senators present is required. Conviction automatically removes the defendant from office. Following conviction, the Senate may vote to further punish the individual by barring them from holding future federal office, elected or appointed. Conviction by the Senate does not bar criminal prosecution. Even after an accused has left office, it is possible to impeach to disqualify the person from future office or from certain emoluments of their prior office (such as a pension). If there is no charge for which a two-thirds majority of the senators present vote "guilty", the defendant is acquitted and no punishment is imposed.
 History of federal impeachment proceedings
Congress regards impeachment as a power to be used only in extreme cases; the House has initiated impeachment proceedings only 62 times since 1789 (most recently against President Bill Clinton), and only occupants of the following 16 federal offices have been impeached:
- Two presidents:
- One cabinet officer, William W. Belknap (Secretary of War). He resigned before his trial, and was later acquitted. Allegedly most of those who voted to acquit him believed that his resignation had removed their jurisdiction.
- One Senator, William Blount (though the Senate had already expelled him).
- One Justice of the Supreme Court of the United States, Samuel Chase in 1804.
- Twelve other federal judges, including Alcee Hastings, who was impeached and convicted for taking over $150,000 in bribe money in exchange for sentencing leniency. The Senate did not bar Hastings from holding future office, and Hastings won election to the House of Representatives from Florida. Hastings's name was mentioned as a possible Chairman of the House Permanent Select Committee on Intelligence, but was passed over by House Speaker-designate Nancy Pelosi, presumably because of his previous impeachment and removal. Source U.S. Senate
Many mistakenly assume Richard Nixon was impeached. While the House Judiciary Committee did approve articles of impeachment against him and did report those articles to the House of Representatives, Nixon resigned prior to House consideration of the impeachment resolutions and was subsequently pardoned by President Ford.