US President Andrew Johnson
The U.S. Senate has sat as a court of impeachment in the following cases:
William Blount, senator from Tennessee; charges dismissed for want of jurisdiction, January 14, 1799.
John Pickering, judge of the U.S. District Court for New Hampshire; removed from office March 12, 1804.
Samuel Chase, associate justice of the Supreme Court; acquitted March 1, 1805.James H. Peck, judge of the U.S. District Court for Missouri; acquitted Jan. 31, 1831.
West H. Humphreys, judge of the U.S. District Court for the middle, eastern, and western districts of Tennessee; removed from office June 26, 1862.
Andrew Johnson, President of the United States; acquitted May 26, 1868.