Just keep him on the hot seat for the next two years if he won’t resign or cough up the truth.
The truth is that he’s been a witting conspirator in a government plot to overthrow and undermine the Presidency just like his rotten predecessors and their henchmen like Mark Felt.
The SOBs get into power and then act like they own the damn government.
I would characterize it as Deep State/Democrat Party/Extreme
Leftist/Communist plot to overthrow a duly elected President.