The GOP House can derail the Donald simply by not allocating any money. Donald Trump is not nearly as charismatic as you seem to believe. His force of will is meaningless. This is what you are describing.
LOL ! Power of the purse ? Just like they AREN’T doing now ?
They are bending over for BO and he hasn’t had to lift a finger to get them to get on their knees and worship him ... Trump with the bully-pulpit = unstoppable