If Trump in jail, try habeus corpus. Under 28USC2254 exhaustion of state remedies is unnecessary if “circumstances exist that render such process ineffective to protect” his rights. He has a right to run for President without an unconstitutional felony conviction on his record.
If another Republican leaves Congress before the session expires, the Democrats will have the majority. Let’s say that happens in May of this year. At that point, what is to prevent the House and Senate from passing a bill giving citizenship to all illegal aliens and giving them automatic voter registration so they can vote for President in the November election? If that happens, won’t the vast majority of the new Americans vote for the Democrats, thereby destroying any chance of any Republican candidate from becoming President, for now, and probably forever? The threat of electoral repercussions for the Democrats would not stop them from doing this because they would create more than enough new Democrat voters to compensate.