“Anybody, and I mean anybody who is not on the president’s agenda that works in this administration should absolutely be removed immediately,” Lewandowski told “Fox & Friends” on Wednesday morning.

“I don’t know who the leaker is but let me tell you this, if it were up to me, and somebody was speaking to the media [and leaking information detrimental to Trump], I would fire them on the spot, and Donald Trump will do the same,” he added.

Numerous accounts in the wake of the Trump Jr. revelations have described the White House as racked by internal drama and suspicion. In seeming reference to such stories, the president tweeted Wednesday morning: “Remember, when you hear the words ‘sources say’ from the Fake Media, often times those sources are made up and do not exist.”

But there is little question the president’s inner circle would like to get to the bottom of the leaks.

The latest – and perhaps most serious – Russia-related controversy started when The New York Times began reporting on a meeting Donald Trump Jr., then-campaign chairman Paul Manafort and Trump son-in-law Jared Kushner had last summer with a Russian lawyer who apparently offered to provide dirt on Hillary Clinton.