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(CNN) —  

Secretary of State Mike Pompeo on Monday said that he asked President Donald Trump to remove State Department Inspector General Steve Linick because the independent watchdog was “undermining” the department and wasn’t performing in a way that the top US diplomat wanted him to.

“I went to the President and made clear to him that Inspector General Linick wasn’t performing a function in a way that we had tried to get him to, that was additive for the State Department, very consistent with what the statute says he’s supposed to be doing,” he told The Washington Post in his first public comments on the matter. “The kinds of activities he’s supposed to undertake to make us better, to improve us.”

He did not go into details about what specifically displeased him about Linick’s job performance.

Speaking at the White House Monday, Trump repeatedly said he fired Linick – whom the President claimed not to know – at Pompeo’s request.

“I said, ‘Who appointed him?’ And they say, ‘President Obama.’ I said, ‘Look, I will terminate him.’ I don’t know what’s going on other than that. You would have to ask Mike Pompeo. They did ask me to do it, and I did it,” Trump said.

Trump informed Congress on Friday of his intent to fire Linick. A senior State Department official told CNN then that Pompeo had made the recommendation.

The Office of Inspector General acts as an independent watchdog of the State Department. One of its core values is “integrity.” “We maintain our independence and act with courage, honesty, and professionalism. Our work is fact-based, objective, and supported by sufficient evidence that meets professional standards,” it states on its website.

A former senior State Department official told CNN that “an independent IG’s job is to be that: independent. If the IG is doing his job, the IG is going to be at odds with the seventh floor. The IGs job is to uncover waste fraud and abuse,” they said.

IG investigations into Pompeo

On Friday night, House Foreign Affairs Chairman Eliot Engel, a New York Democrat, revealed that Pompeo had been under investigation by the Inspector General’s office. A Democratic aide told CNN this weekend that the IG had been probing whether Pompeo made a staffer perform a variety of personal errands, including walking his dog.

Engel said Monday that the ousted IG had almost finished an investigation into Pompeo’s decision to fast-track an $8 billion arms sale to Saudi Arabia. Later on Monday a congressional aide confirmed that Pompeo had refused to sit for an interview with the inspector general’s office as part of that investigation.

Pompeo claimed he was not aware that Linick was investigating him at the time he recommended that the IG be removed. According to the Post, he only knew about one case “involving a national security matter.”

“It is not possible that this decision, or my recommendation, rather, to the President, rather, was based on any effort to retaliate for any investigation that was going on, or is currently going on,” Pompeo said. “Because I simply don’t know. I’m not briefed on it. I usually see these investigations in final draft form 24 hours, 48 hours, before the IG is prepared to release them.”

“So it’s simply not possible for this to be an act of retaliation. End of story,” he said.

Pompeo would not address questions related to whether he asked government employees to run errands for him, telling the Post, “I’m not going to answer the host of unsubstantiated allegations about any of that.”

Former State Department official Laurel Miller noted on Twitter that “it’s not plausible that Pompeo would not know about an IG investigation *of himself* until ‘24 to 48 hours’ before it’s done because the target of an investigation would be notified and interviewed.”

Trump, speaking at the White House Monday, suggested that the top US diplomat may have thought he “was being treated unfairly.” Although he said he did not know about the purported investigation into potential misuse of staff, the President downplayed the seriousness of such a probe.