Washington (CNN) Andrew Peek, the senior director for European and Russian Affairs at the National Security Council, is now on administrative leave, a source familiar with the matter confirmed to CNN.

Peek, the third person to occupy the job in the last year, was escorted off the White House grounds on Friday, that source and a separate source also told CNN.

Peek had only worked in his NSC position for several months. He formerly worked at the State Department as the Deputy Assistant Secretary of State for Iraq and Iran.

CNN has reached out to Peek for comment but has not heard back.

Axios first reported Peek had been placed on administrative leave pending a "security-related investigation."

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