Well, I think the main point GFGT is making is how can Trump even promise that he will drain the swamp without that Republican backing?It would have been world changing if all republicans had worked as a team to take on the democrats that executed solid teamwork in 2017/2018. They might have been thrown out on their head for it but they could have left a massive change for the good that dems would have had to work hard to overturn.
A President alone does not have the power to turn back congress, he must have help…
You're right he can't do it alone so how can he make that promise knowing that? Maybe he should have said I will pledge to drain the swamp if my fellow Republicans will do the same with me.