Democratic Sen. Ron Wyden (D-Or.) on Thursday accused the Trump administration of withholding “essential” information lawmakers need to  perform oversight.

“We’re talking about the essential responsibilities of the Congress, which is to do vigorous oversight and the pattern of non-cooperation we are seeing from the White House,” Wyden told CNN’s Alisyn Camerota on CNN’s “New Day.”

“It’s just a complete stonewall,” says Sen. Ron Wyden as Democrats accuse the White House of withholding information https://t.co/39cxRACMXU

— New Day (@NewDay) May 25, 2017

{mosads}Wyden said the White House has denied claims that the Centers for Medicare and Medicaid’s administrator told insurance companies that they would get cost-sharing money if they supported the American Health Care Act (AHCA), but he has yet to see additional, specific information.

Wyden added that there are several other examples of the White House failing to provide details needed for oversight.

“It’s a complete stonewall. We get nothing,” he told Camerota.

The Democratic senator, who sits on the Budget committee, said he has never seen this kind of behavior from previous administrations.

“We have never seen anything like this either from a Democratic or Republican administration, this pattern of completely shutting down a response to congressional oversight,” he said.

Wyden’s comments as the Trump administration faces intense scrutiny over a series of bombshell stories and leaks in the investigation into the Trump campaign and Russian meddling in the U.S. election.