Democrats kept hammering former national security adviser Michael Flynn as a pre-eminent example of what they call the Trump administration’s questionable ethics.

Rep. Elijah E. Cummings, the ranking member on the House Oversight and Government Reform Committee, called Thursday for the declassification of documents related to the activities of Flynn, a onetime head of the Defense Intelligence Agency and a senior Trump campaign official.

The Maryland Democrat worked with Pentagon officials to release redacted versions of three documents on Thursday that showed Flynn was notified when he retired from the military in 2014 of his responsibilities to get approval to receive payments from foreign sources.

“We have no evidence, not a shred, that he disclosed his payments,” Cummings said of funds Flynn obtained from the Russian government-run media outlet RT.

Cummings was speaking at a news conference with Senate and House Democrats to highlight areas where President Donald Trump has failed to drain the metaphorical swamp.