The ten-year sentence was given on conviction of treason for aiding a foreign power.
The constitution says the president "shall be removed from office on impeachment for, and conviction of, treason, bribery, or other high crimes and misdemeanours".
Attainder, in English law, the extinction of civil and political rights resulting from a sentence of death or outlawry after a conviction of treason or a felony.
The Constitution says a conviction of treason requires a confession in open court or testimony from two witnesses to the same overt act.
Article II, section 4 of the constitution states that high officials meaning cabinet members and judges, as well as the president may be removed from office "on impeachment for, and conviction of, treason, bribery, or other high crimes and misdemeanours".
The U.S. Constitution states that, "The President, Vice President and all civil Officers of the United States, shall be removed from Office on Impeachment for, and Conviction of, Treason, Bribery, or other high Crimes and Misdemeanors". (Article II, Section ).
