He is, the Republicans are behind him basically 100%, they’re officially nominated in June (August if their party is already in charge), he’s been removed from like two ballots so far with some other petitions in the works (but they’re all blocked until the supreme court can rule on it), and most* republicans won’t care if he gets arrested.

*Keyword being most. If he DOES get arrested, enough republicans would likely stay at home for Biden to eke out a narrow lead. Not many republicans, though.