Hillary! is his master. He’s in it to wound or drive out any potential threat to her. He’s like an unwanted guest who comes in, leers around, eats all the snacks, puts his feet on the furniture and doesn’t flush the toilet then runs third party because the homeowners insulted him.
Just to be clear, the GOPe is disgusting.
I wouldn't go so far as to say she's Trump's master, but the fact Trump is close friends of the Clintons is a bit unsettling.