Federal pardons - yes.

Here is something that I haven't seen from the "legal experts" though. Let's say CONgress brings him in for questioning. Everyone says he lost his 5th amendment protections so he would have to testify. The problem with this is he is still liable for state crimes (as his fake federal pardon won't protect him there).

Being forced to testify on the record in CONgress would absolutely give any state evidence that could be used in their courts. Regardless of how detestable this rodent is, that should not be allowed. Remember - they will do that to both sides when someone is pardoned once it is done one time.

CONgress should have to wait on the states before they interview him. Or - let other countries (who don't have this issue) do it first. For that matter, do Nuremberg part 2. Let them string him up. The first dozen or so trials there were quickly adjudicated, sentenced, and the people were marched to the gallows. I'm talking minutes between sentencing and swinging, and that was so fast some of the bodies were laid behind the gallows so the next guy up could swing.

It would probably take longer this time around, because Europe is basically socialist/communist, but even if he was found not guilty we could use the evidence for sate trials here without setting precedence on violating the 5th.