The senior in Cohen-Watnick’s title reflects the importance of his job, if not the level of experience he brings to it. The senior director for intelligence programs on the NSC is a powerful position, designed to coordinate and liaise between the U.S. intelligence community and the White House.

"If the incumbent has an effective working relationship with the national-security adviser or even the president directly, the senior director for intelligence has an opportunity to exercise considerable influence on intelligence policy, covert actions, and sensitive collection operations," said Stephen Slick, a former CIA official who held the position during the Bush administration.

The CIA has traditionally had control over who fills this position, and normally the job is staffed by a more experienced official. McMaster, assuming he’d be allowed to relieve or reassign Cohen-Watnick, had gone so far as to interview Cohen-Watnick’s potential replacement, Linda Weissgold, a veteran CIA officer.

Despite his prominent, and apparently quite secure, position in Trump’s NSC, little is known about Cohen-Watnick, who had spent much of his short career as a low-ranking official at the Defense Intelligence Agency. Information about him in publicly available sources is scarce. Few higher-ups from the DIA remember him. Only one picture of him can be found online, a snapshot unearthed by Al-Monitor’s Laura Rozen.

Unlike other White House officials who have become public figures in their own right, Cohen-Watnick never speaks for himself publicly, leaving others to fill the void. Yet he hardly comes into sharper focus when you talk to co-workers, friends, and former colleagues. Ask around about Ezra Cohen-Watnick, and people get defensive. Some profess not to know him, or ask why anyone would want to write about him. Others simply refuse to discuss him.

“I won’t talk to any journalist about Ezra,” said Michael Ledeen, a Flynn confidant who knows Cohen-Watnick well.

“Is it one of your hit pieces?” asked Bannon, who didn’t respond to a further request for comment.

Bannon and Ledeen may be wary of talking about Cohen-Watnick after his first, and thus far only, turn in the national spotlight. Washington got its first real look at Cohen-Watnick when he was identified as one of two White House sources who provided House Intelligence chairman Devin Nunes with evidence that former national security adviser Susan Rice requested the “unmasking” of the names of Trump associates in intelligence documents. In the intelligence world, incidental collection refers to intelligence agencies obtaining, in the course of monitoring foreigners, communications that either refer to or involve Americans, whose names are typically “masked” unless officials request that they be “unmasked.”

The incident, coming in the aftermath of Trump baselessly accusing his predecessor of wiretapping Trump Tower, became one of the first dust-ups related to the investigations into possible Russian collusion during the 2016 campaign that have gripped the White House. The president later accused Rice of having committed a crime; for her part, Rice has denied that she ordered the unmasking for political purposes.