The problem may be that EVERYBODY is dirty in the government, in one way or another, all the way down to city council. If anyone goes after a dumocrap, that dumocrap will spill the beans on as many republicans as possible and when the shit hits the fan, everybody gets covered in it. There was a very good reason why Trump's first term advisors explicitly told him to NOT go after Clinton, she has dirt on everybody. Her own party hated her and were too scared to do anything about her. It's all organized crime, and nobody dares step out of line.