Seriously, the cowardly GOP congress will not impeach the orange lardo and will only ask him to resign when the 2018 midterms begin looking dismal for republicans.
The "best" scenario is Trump resigns for "health related reasons, blah, blah, blah....."
The "worst" scenario is Trump resigns because of pending revelations of collusion with Russia...or financial misdeeds or emolument issues .......this would force Pence to issue a pardon,
and we all know how THAT worked out for the decent, poor Gerald Ford.