What does the senate set or provide for an impeachment trial?

Answer

The Senate acts as a trial court and jury after impeachment (indictment) by the House.

Answer

Impeachment is a two-step process; the impeachment phase is similar to a Grand Jury hearing, where charges (called "articles of impeachment") are presented and the House of Representatives determines whether the evidence is sufficient to warrant a trial. If the House vote passes by a simple majority, the defendant is "impeached," and proceeds to trial in the Senate.

The Senate trial, while analogous to a criminal trial, only convenes for the purpose of determining whether a Justice, the President (or another officeholder) should be removed from office on the basis of the evidence presented at impeachment.

At the trial a committee from the House of Representatives, called "Managers," act as the prosecutors. Per constitutional mandate (Article I, Section 3), the Chief Justice of the United States (Supreme Court) must preside over the Senate trial of the President. If any other official is on trial, an "Impeachment Trial Committee" of Senators act as the presiding judges to hear testimony and evidence against the accused, which is then presented as a report to the remained of the Senate.

The full Senate no longer participates in the hearing phase of the removal trial. This procedure came into practice in 1986 when the Senate amended its rules and procedures for impeachment and has been contested by several federal court judges, but the Supreme Court has declined to interfere in the process, calling the issue a political, not legal, matter.

At the conclusion of the trial, the full Senate votes and must return a two-thirds Super Majority for conviction. Convicted officials are removed from office immediately and barred from holding future office. The Senate trial, while analogous to a criminal trial, only convenes for the purpose of determining whether a Justice, the President (or another officeholder) should be removed from office on the basis of the evidence presented at impeachment.

For more information, see Related Questions, below.