He needs to be combative with the establishment... he is getting nowhere working with them.
If he called them out everyday he would get re elected and they would get primaried.
What does he have to lose?
They have enough right now to impeach him if they wanted.All dems would support it so they only need a small % of republicans in the house and around 27 in the senate.If Trump starts picking fights against enough individual members of congress they can retaliate.