President Donald Trump’s chief of staff, John Kelly, has been questioned by special counsel Robert Mueller’s team of investigators as part of a probe into potential obstruction of justice, a new report says.

CNN reported Friday that Kelly, who reportedly is on the verge of leaving the White House, answered a “narrow set of questions” from Mueller’s investigators.

That sit-down came after White House lawyers first objected to Kelly being interviewed.

CNN reported: “The Mueller questions to Kelly centered on a narrow set of issues in the investigation of potential obstruction of justice, chiefly Kelly’s recollection of an episode that took place after new reporting emerged about how the President had tried to fire Mueller.”