Newly released documents reveal former Trump National Security Adviser Michael Flynn had been warned by the Pentagon not to take money from foreign governments.

Retired Lt. Gen. Michael Flynn, Defense Intelligence Agency

Top Democrat on the House Oversight Committee Rep. Elijah Cummings, (D-Md) released three new documents on Retired Lt. Gen. Michael Flynn, including a letter from the Defense Intelligence Agency counsel’s office in response to an inquiry from Flynn in October of 2014. The unclassified letter from the DIA indicates it cannot locate any records of Flynn receiving foreign payments and his seeking permission to do so.

According to Cummings, the Pentagon warned Flynn, citing ethics restrictions on retired military officers, that receiving foreign payments without prior approval was prohibited under the Emoluments Clause of the U.S. Constitution.

“The Pentagon’s warning to Gen Flynn was bold, italicized and could not have been clearer,” said Cummings a news conference today.  He called on the White House to provide the documents requested by the House Oversight Committee for its investigation into Flynn.

According to a Pentagon spokesman, the Defense Department inspector general opened an investigation on April 4 into whether or not Flynn sought permission to receive foreign payments and potential violations of the Emoluments Clause.

Cummings said in a statement, “These documents raise grave questions about why General Flynn concealed the payments he received from foreign sources after he was warned explicitly by the Pentagon.”

Flynn, President Trump’s first national security adviser, was fired after misleading Vice President Mike Pence about his conversations with Russian Ambassador Sergey Kislyak.