The letter, dated Sept. 21 and published Friday by the Republican chair of the committee, Sen. Chuck Grassley, does not detail why Clinton made the request, except that she did so on Aug. 30. An aide to Clinton did not respond to a request for comment.

The request came shortly after the Trump administration revoked former CIA Director John Brennan’s security clearance, citing what White House press secretary Sarah Sanders said was “erratic behavior” and “a series of unfounded and outrageous allegations, wild outbursts on the Internet and television about this administration.” To many, however, it was a naked attempt to punish a vocal critic. Brennan himself called it “part of a broader effort by Mr. Trump to suppress freedom of speech and punish critics.”