"A University of Kansas professor said it’s well within the President’s powers to pardon former Maricopa County Sheriff Joe Arpaio, as he did last week.
'The President is given an explicit power in the Constitution to issue pardons,' said Richard Levy, the J.B. Smith Distinguished Professor of Constitutional Law at the University of Kansas. 'The Constitution doesn’t indicate any limits or substantive requirements or procedures. There aren’t any legal avenues to challenge the validity of a pardon.'”