The constitutional remedy for a president who directs the Department of Justice to prosecute a person the Department has already conceded is innocent of the crime is impeachment, removal, and disqualification, followed by criminal and civil proceedings.
BREAKING WSJ: Trump White House officials have asked the Trump Justice Department to consider a new prosecution of David Hearn, the man accused of vandalizing the Reflecting Pool — as Trump fumes over U.S. Attorney Jeanine Pirro's decision to drop the case.