I would say right now that McConnell and Nunes have the most explaining to do to Trump...by far. All the others would be expected to go along and support the coup...those two are hanging out there like sore thumbs.
McConnell is probably going to be able to slime through because he’s a prime member of the most corrupt legislative body in the history of mankind. Nunes better have notified Trump of this right away...or things might not be very pleasant moving forward.
Nunes stepped aside from anything related to the Russian investigation in April of 2017 and didn't come back until the fall.