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“He says he was out of the loop. It looks like he was,” Mr. Conyers said. “It’s very hard to accept that for all this period of time he didn’t know anything, he didn’t hear anything.”

Rep. Linda T. Sanchez, California Democrat, said Mr. McNulty “did a good job of being evasive.”

Rep. Chris Cannon, Utah Republican, said Mr. McNulty answered questions thoroughly and “left the Democrats with nothing.”