I see 3 possibilities:
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POTUS pardons himself. This would be controversial in Trump fashion, and may or may not protect him.
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POTUS temporarily relinquishes the Presidency to Vice President Pence, The then President Pence grants Trump a full and complete pardon, then Pence relinquishes the Presidency back to Trump. The risk to this scenario is Pence. Would he actually pardon Trump?
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Nothing happens and Trump is subject to an endless laundry list of charges, criminal and civil.
Thoughts?
They also aren't billionaire 2 term presidents.