yes
No, only the President of the United States has the power to pardon felons, not Congress.
Yes, the president has the power to pardon someone convicted of treason.
Yes
a pardon(like in a general pardon) or amnesty
The US President cannot pardon someone convicted of crimes other than federal crimes, he cannot pardon someone who has been impeached (and tried, and convicted), and he cannot pardon himself. He also cannot pardon someone for crimes not yet committed. However, there is no requirement that someone actually be convicted, so a Presidential pardon can effectively block any prosecution.
no
Yes.
The president can pardon or excuse people charged with federal crimes. He can pardon people from future indictments associated with past acts, as Gerald Ford did for Richard Nixon. He can also pardon people convicted by military courts martial and can issue blanket amnesty for all people who have violated laws that are no longer applicable as Carter did for people to fled the country to dodge the military draft during the Vietnam War .
The president has the power to give a pardon with the help of other officials. The president has the power to give a pardon with the help of other officials.
The presidential action of forgiving a person convicted of a crime is referred to as a pardon. Many times a president will pardon several people on his last day in office.
The President has the power to pardon those who are convicted or even accused of federal crimes.
Nixon could have been tried and convicted.