Top law enforcement and intelligence officials briefed congressional leaders from both parties on May 24 about the F.B.I.’s use of an informant in the Russia investigation, a highly unusual concession to Congress all but ordered by President Trump.
House Republicans close to the president, led by Representative Devin Nunes, Republican of California and the Intelligence Committee chairman, had been pressing unsuccessfully for weeks for access to material related to the informant, issuing a subpoena and threatening to hold top Justice Department officials in contempt of Congress for refusing to turn it over.
