Is there ANY mechanism that would stop Trump pardoning someone or selling pardons quickly?
Is there anyway to rescind Presidential pardons?
I don't think so.
It should be possible for the federal courts, ending at the Supreme Court, to declare null and vold a pardon which was outside the powers of the President.
There seems to be reasonable agreement that it is outside the powers of the President to pardon himself, mainly on the ground that a pardon is "given" and a President can't "give" himself something.
I would like to think that there is also an argument based on the Presidential Oath of Office, which states "I do solemnly swear (or affirm) that I will faithfully execute the Office of President of the United States, and will to the best of my ability, preserve, protect and defend the Constitution of the United States."
1. The President cannot take office until the Oath is sworn.
2. The Oath must have more meaning than just being a form of words to be spoken, otherwise the President could recite something as meaningless as "Humpty Dumpty" in order to become President.
3. The Oath is a statement about the President's future actions: "will".
4. The Oath is therefore a statement that means that the President's powers and future actions are limited by its words.
5. The President is therefore limited to issuing pardons which faithfully execute his office and preserve, protect and defend the Constitution.
6. A Presidential pardon for himself does not uphold the Constitution. Nor does a Presidential pardon for any person who is a co-conspirator with the President or has committed crimes jointly with or in collusion with the President or has committed crimes in the role of member of the President's Administration.
That may all be wishful thinking of course, but it's an argument I'd be prepared to make in court. The overarching argument in its favour is that it is the only/best logical argument available to ensure that a President, the President's co-conspirators and the President's henchmen in the Administration are not effectively placed above and beyond the law for their four year term by the exercise of the Presidential power of pardon. The emphasis on the Oath of Office having meaning and effect should be welcome to the "originalists" on the Supreme Court.
Without this argument, the President, the Presidency and the Administration are all effectively above the law.
"Did Magna Carta mean nothing to you? Did she die in vain?" (Hancock)