WASHINGTON – Michael Flynn, President Donald Trump's first national security adviser, may have violated federal law by not fully disclosing his business dealings with Russia when seeking a security clearance to work in the administration, the top oversight lawmakers from both parties in the House said Tuesday.

The finding came after Rep. Jason Chaffetz, R-Utah and chairman of the House oversight committee, and other lawmakers on the panel reviewed classified documents related to Flynn, including the form he filled out in January 2016 to renew his security clearance, known as an SF-86.

As part of the review, Rep. Elijah Cummings of Maryland, the committee's senior Democrat, said Flynn did not disclose in those documents payments totaling more than $45,000 he received from the ­Russian ­government for giving a speech in Moscow in 2015.

Chaffetz also said Flynn appeared to have inappropriately accepted payments from companies linked to Russia without first getting required approval from the Pentagon and the State Department.

"As a former military officer, you simply cannot take money from Russia, Turkey or anybody else," Chaffetz said. "And it appears as if he did take that money. It was inappropriate, and there are repercussions for a violation of law."

The development shows that Flynn's short time as Trump's national security adviser continues to be a distraction for the White House, months after he was fired for misleading Vice President Mike Pence about his conversations with the Russian ambassador to the United States, Sergey Kislyak. In March, Flynn filed papers acknowledging that he worked as a foreign agent last year representing the Turkish government, causing another uproar.

Chaffetz and Cummings also said White House officials refused their request to turn over other internal documents related to the hiring and firing of Flynn.

Sean Spicer, the White House press secretary, said Tuesday that "to ask for every call or contact that a national security adviser made is pretty outlandish, if you will."

In a letter to the lawmakers, the White House cited concerns about disclosing classified information with regard to Flynn's interactions as national security adviser — adding it simply does not possess the information predating his time in the administration.

"In short, the White House has refused to provide this committee with a single piece of paper in response to our bipartisan request, and that is unacceptable," Cummings said.

At the very least, Chaffetz said, any inappropriate payments to Flynn should be recovered. Cummings pointed out that "knowingly falsifying or concealing a material fact is a felony which may result in fines and/or up to five years imprisonment."

Robert Kelner, Flynn's lawyer, played down the significance of the allegations. But he did not dispute the committee's assertion that Flynn had failed to disclose the information.

"As has previously been reported, General Flynn briefed the Defense Intelligence Agency, a component agency of DOD, extensively regarding the RT speaking event trip both before and after the trip, and he answered any questions that were posed by DIA concerning the trip during those briefings," he said in a statement.

It was only after Flynn was forced out as national security adviser that his dealings in Russia came into sharper focus.

In March, congressional investigators led by Cummings revealed Flynn had been paid more than $65,000 by companies linked to Russia in 2015. That included more than $45,000 from RT, the Russian government's English language television channel, for his Moscow speech, which lawmakers said he failed to disclose.

Flynn also came under scrutiny for belatedly filing papers — after his departure from the Trump administration — registering as a foreign agent for his work last year lobbying on behalf of Turkey in a dispute with the U.S. government. He was paid more than $500,000.