Since the 1990s I have said that politicians behavior indicates that they are being blackmailed. It got worse after Hillary Clinton illegally obtained (and was caught doing it) about 1,000 FBI files on Republican politicians. One Congressman, Bob Livingstone, did not succumb to the pressure. He was gone in one day after the blackmailers followed through and leaked to the press an affair he had.
Other politicians appear to have got the message and are not as brave as Livingstone.
James Corbett of the Corbett Report has put out a video on this very issue. One example Rep. Jason Chaffetz exposed problems in the Secret Service and they leaked secret info to harm him.