Challenging the electors would seem to be a no go. It needs simple majorities in both houses. https://govtrackus.s3.amazonaws.com/legislink/pdf/stat/24/STATUTE-24-Pg373.pdf https://www.businessinsider.com.au/gop-reps-trump-challenging-electoral-votes-is-unlikely-to-succeed-2020-12 "both chambers would have to vote by a simple majority to reject a state’s electors" It only goes to the House with one state one vote if there is no majority of electors for a presidential candidate.