He’s not a team player - Rand thinks he’s been elected President and HE gets to make the calls. What a jerk.
You are assuming that everybody who voted for Trump did so because they agree with his position on every issue. That clearly is not the case.
I voted for Trump as the lesser of two evils, and hoped that conservatives in Congress would act as a break on Trump's populist, deficit-busting plans.
You obviously don't agree with that, but the point is you simply can't assume that the fact that Trump was elected president means that everybody who voted for him supports everything he wants to do, and believes Congress should just roll over and give him whatever he wants.