Some Congressional staff members said they believed that the bureau should have informed at least the Republican and Democratic leaders of the House and Senate Intelligence Committees about the unfolding inquiry. A spokesman for Representative Mike Rogers, a Michigan Republican who heads the House Intelligence Committee, said the lawmaker had summoned Sean Joyce, the F.B.I.’s deputy director, and Michael J. Morrell, the deputy C.I.A. director, for closed briefings on Wednesday about the investigation.
Eric Cantor, the House majority leader, said Saturday an F.B.I. employee whom his staff described as a whistle-blower told him about Mr. Petraeus’s affair and a possible security breach in late October, which was after the investigation had begun.
“I was contacted by an F.B.I. employee concerned that sensitive, classified information may have been compromised and made certain Director Mueller was aware of these serious allegations and the potential risk to our national security,” Mr. Cantor said in a statement.
Mr. Cantor talked to the person after being told by Representative Dave Reichert, Republican of Washington, that a whistle-blower wanted to speak to someone in the Congressional leadership about a national security concern. On Oct. 31, his chief of staff, Steve Stombres, called the F.B.I. to tell them about the call.