They congressmen also raised new questions about Flynn's consulting firm accepting USD 530,000 from a company tied to Turkey's government.
Republicans Jason Chaffetz, R-Utah, and Elijah Cummings, D-Md, said Flynn could be criminally prosecuted because, as a former Army officer, he was barred from accepting the foreign payments. Flynn, who headed the military's top intelligence agency, is a retired lieutenant general and was Trump's national security adviser until he was fired.
Cummings also criticized the White House for refusing to turn over documents the committee requested about Flynn's foreign contacts during his three-week stint as national security adviser.
"That is simply unacceptable," he said.
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Flynn campaigned vigorously for Trump before the presidential election and was chosen as national security adviser in January. But Trump fired him in February on grounds that he had failed to notify senior administration officials about his contacts with Russian officials before his appointment.
Flynn's lawyer said in a statement that Flynn disclosed the trip, organized by the Russia Today news organization, in conversations with the Defense Intelligence Agency, where he was its former director.
"As has previously been reported, General Flynn briefed the Defense Intelligence Agency, a component agency of (the Defense Department), extensively regarding the RT speaking event trip both before and after the trip, and he answered any questions that were posed by DIA concerning the trip during those briefings," attorney Robert Kelner said.