Former national security adviser Michael Flynn was warned by the Defense Intelligence Agency in 2014 against accepting foreign payments as he entered retirement, according to new documents obtained by the House oversight committee.

The inspector general of the Department of Defense also opened an investigation of Flynn earlier this month, according to an April 11 letter released by the oversight committee Thursday:

“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,” said Rep. Elijah Cummings, the top Democrat on the House oversight committee, in a statement. “Our next step is to get the documents we are seeking from the White House so we can complete our investigation. I thank the Department of Defense for providing us with unclassified versions of these documents.”

Now that the Pentagon is investigating Flynn, the Trump Whitehouse is getting defensive. Sean Spicer, Trump’s spokesman, claims that Cummings is not telling the truth.