Despite Trump’s vehement defense of his decision to terminate Atkinson, some Republican senators expressed uneasiness with the president’s actions and praised Atkinson.

Sen. Chuck Grassley, for example, said the firing of Atkinson “demands an explanation.”

The Iowa Republican, who crafted the nation’s whistleblower protection statutes, did not criticize Trump for firing Atkinson, as several top Democrats did when Trump relieved Atkinson of his duties late Friday night. But he said the Trump administration should explain the move in greater detail.

“[Inspectors general] help drain the swamp, so any removal demands an explanation,” Grassley said in a statement on Saturday. “Congress has been crystal clear that written reasons must be given when IGs are removed for a lack of confidence. More details are needed from the administration.”