Utah Republican Rep. Jason Chaffetz told the Fox News Channel’s Megyn Kelly on Friday that although a key White House witness in the ill-fated Operation Fast and Furious gun-walking program is willing to testify about what he knows, the Obama administration won’t let him appear before Congress.

White House Counsel Kathryn Ruemmler sent a letter Thursday to Republican lawmakers Rep. Darrell Issa and Sen. Chuck Grassley, refusing their request to speak with Kevin O’Reilly, a former National Security staff member whose emails place him in the middle of the unfolding scandal. Issa and Grassley had written to Ruemmler on March 28, asking the White House to step aside and let O’Reilly talk to investigators.

Grassley is the GOP ranking member on the Senate Judiciary Committee. Issa chairs the House Committee on Oversight and Government Reform, whose members include Chaffetz.

“[O’Reilly’s] personal attorney indicated that he’s more than willing to talk to the committee, on the record, under oath”” Chaffetz told Kelly during her Friday afternoon broadcast. “It is only the White House and the White House Counsel that is saying they will not make him available.”

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