From the AP

"Reps. 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.
"That money needs to be recovered," said Republican Chaffetz, chairman of the House Committee on Oversight and Government Reform. "You simply cannot take money from Russia, Turkey or anybody else."