Disclaimer - while I believe Trump is as bad as any politician, I don't believe that is why the traditional politicians are after his blood. They want him out because he's not "one of the boys".
the repubs could possibly get yet another one of their judges onto the Supreme Court.. and 53 Republican members of Congress who voted for his tax cuts could be putting an extra $200k+ per year into their own pockets. not one of the boys?? they're laughing all the way to the bank.