Trump nominated Gen Milley.
Trump selected and embraced Mike Pence twice to be his Vice President.
Trump appointed John Bolton.
Trump appointed John Kelly. Etc etc
Any appointment is subject to approval by the Senate. In the middle of Russia, Russia, Russia, they weren’t going to permit anyone other than someone like Wray. As you recall, every broadcast and every politician except for a very limited number ALL talked as if Trump was guilty. He wasn’t. He was set up from the start and they’re still doing the same thing.
No other president has ever had to endure the same thing... nor any other staff.