Yeah, the lynching thing is whiny, offensive, and stupid. But let’s take a closer look:
So some day, if a Democrat becomes President and the Republicans win the House, even by a tiny margin, they can impeach the President, without due process or fairness or any legal rights.
Well, yes: a majority in the House can impeach a president for whatever they choose to (subject to lots of practical political considerations, of course).
This is another case (among countless others) where Trump doesn’t know anything, or how anything works.
without due process or fairness or any legal rights.
Yes: It’s a political process, not a judicial process. Like the emoluments clause, which he seems to think is “phony,” impeachment (as it turns out) is constitutional.