Not much. The day he tells the truth will be the day no one will believe him.
He didnt didnt know about the payment he made to Stormy Daniels to keep her quiet.
He didnt know about the June 2016 Trump Tower meeting when in fact he did.
...didnt know "much about" Julian Assange.
...the Manafort Russia connection
...people he knows, especially Russian oligarchs and billionaires who helped him monetarily with his campaign
....that he didnt try to fire Mueller several times
That the Airforce stayed at his hotel in Scotland