Trump will be easily re-elected.
However, the Senate is another matter. People know Trump is not a Republican, that's why they love him.
I have the Senate D+6 and the House D+15, because the GOP offers nothing to ordinary Americans (except, "we're not as bad as them").
Remember how vulnerable the GOP was — especially in the Senate — early in that election year. The Democrats had targeted Rob Portman in Ohio as one of the most vulnerable Republican incumbents in the U.S. Senate, for example. He ended up winning in a 21-point landslide.