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Yesterday, however, Mr. Leahy accused Mr. Fielding of being uncooperative, in a letter accompanying the subpoenas.

“You have not made any effort to work with us,” Mr. Leahy said. “You have merely restated your initial, unacceptable offer.”

“The White House’s continued stonewalling leads to the obvious conclusion that the White House is hiding the truth because there is something to hide,” Mr. Leahy said.