Joe Arpaio

Arpaio, who was pardoned by Trump last year for a contempt of court charge, has promised to give his full support to the president.

• By Kate Wheeling

The federal agency is arguing that a presidential pardon "moots a criminal case."

• By Kate Wheeling

The presidential pardon power is limited only by shame and politics, one expert says, and Trump is beholden to neither.

• By Kate Wheeling