At this point I'd say that is a given.The GOP only needs to flip about 20 seats to take back the House.
There are 40 dems in districts that Trump won in 2016.
Its very possible for the House to flip back to the GOP.
Based on what? The election is 11 months away. A lot of things can happen between now and then. Nothing is a given this far out.
True, but historically speaking, if Trump can motivate his base, and the democrats don't put up a quality candidate, Trump should have coat-tails.