There was no abuse of process.
The President has unlimited power of pardon in the Constitution.
The charge against Sheriff Joe was a MISDEMEANOR, brought by an out of control Justice Dept, under Holder and Lynch, and abetted by a Clinton appointed kangaroo court judge.
That was where the abuse was, not by Trump.
Were the pardons of Marc Rich, Roger Clinton and Bradley Manning abusive?
Actually the charge was brought by Judge Snow (a Bush appointee).
Under federal law if the DOJ declined to prosecute, the judge would have been required to appoint a prosecutor. So the case was going to trial no matter what.