It is amazing how Republican candidates make a point of emphasizing their support of President Trump. They know Trump has the support of nearly 90 percent of Republicans.
The tone was set early in the Trump admin with GOP senators threatening POTUS over Sessions and then the Mueller protection act. The bureaucracy got a green light from the GOP to obstruct POTUS and MAGA and they have.
Wray and his staff know with certainty they will not be fired and act accordingly. Had they feared exposure by a GOP controlled Senate and job loss they certainly would be more supportive of POTUS. Obviously, the GOP is using The Resistance (TM) to obstruct POTUS and steal the beltway agenda from him.