In the case of Ford's pardon of Nixon, the pardon covered "any crimes he might have committed against the United States while president," as Wikipedia currently

In the case of Ford's pardon of Nixon, the pardon covered "any crimes he might have committed against the United States while president," as Wikipedia currently has it: https://en.wikipedia.org/wiki/Pardon_of_Richard_Nixon https://en.wikipedia.org/wiki/Pardon_of_Richard_Nixon As the entry goes on to state, that was controversial, but it worked. So it should be able to work in a case like this as well.