If Trump wins and has a GOP majority in both houses, what will his first priority be? To overturn the results of the 2020 election, of course. Expect some sort of legislation or resolution stating that the election was rigged and that Trump was lawfully elected to move swiftly through the system after the inauguration.
Would this piece of legislation explicitly invalidate all actions taken by Biden as president? Would it even criminalize expressing the opinion that Trump lost the election? No measure, no matter how extreme, can be completely disregarded here, because the idea of being a loser has always been totally anathema to Trump.