Congress may not restrain the president's power to pardon, except in impeachment cases.

Additionally, this section requires trial by jury in all criminal cases, except impeachment cases.

However all impeachment cases were failed due to absence of one third vote from the members of Congress.

This paper discusses the power of the Senate to try impeachment cases.

That is the heart of the impeachment case.

The Constitution awards the Senate the sole power to try impeachment cases.

Several experts said the most important presentation by the House managers was their analysis of impeachment cases involving Federal judges.

No fixed standard of proof is required for conviction in an impeachment case, and senators are free to evaluate evidence as they choose.

The Senate also tries impeachment cases for federal officials referred to it by the House.

He suggested the Senate could choose to toss out the impeachment case.