The US president can pardon people for federal offenses.
Do any of the President's advisers have criminal records?
The president
No.
No
no.
The President can pardon criminals : release them from criminal responsibility for illegal acts, and/or from sentences imposed by criminal convictions.
Yes
yes.
The president has granted the criminal a reprieve.
Yes, the president can issue pardons for federal offenses.
Well, if he knocked the president unconscious, then he's called a "criminal".
There is no legal reason why a former criminal can not be President. However, it is exceedinlgy unlikely that such as individual would be nominated and elected.