McCain's statement on pardoning Arpaio

And its implication. Here's what he said:

“No one is above the law and the individuals entrusted with the privilege of being sworn law officers should always seek to be beyond reproach in their commitment to fairly enforcing the laws they swore to uphold. Mr. Arpaio was found guilty of criminal contempt for continuing to illegally profile Latinos living in Arizona based on their perceived immigration status in violation of a judge’s orders. The President has the authority to make this pardon, but doing so at this time undermines his claim for the respect of rule of law as Mr. Arpaio has shown no remorse for his actions.”

We know that those of Dump's staff who committed at the very least collusion with Russians in the last election have no fear of prosecution because they know they'll be pardoned. So given that it will be impossible to leverage any of them to testify against the Dump. The only hope is having physical evidence of Dump's collusion. Even then he pardon himself whether it's legal or not, thereby creating a Constitutional crisis.