The F.B.I. learned about the allegations from the two women soon after Mr. Trump was inaugurated. But spokesmen and spokeswomen for the White House have insisted that no senior White House officials knew of the spousal abuse allegations against Mr. Porter until last week. They have said the career government employees at the White House personnel security office who processed the clearances did not tell them about the allegations uncovered by the F.B.I.

Representative Trey Gowdy, Republican of South Carolina and the chairman of the Oversight and Government Reform Committee, said on Wednesday that he was beginning an investigation into the circumstances surrounding Mr. Porter’s security clearance, while six Democratic senators said they were concerned about whether there had been “any mishandling of classified information” because of them. They asked Christopher A. Wray, the F.B.I. director, for the names of other employees at the White House who were working…

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