A 2016 meeting between Rep. Dana Rohrabacher and Michael Flynn, who briefly served as President Donald Trump’s national security adviser, is the subject of inquiries by investigators for Special Counsel Robert Mueller, according to an NBC News report that cited unnamed sources

Mueller is investigating possible collusion with Russians in last year’s presidential elections while Flynn is former lobbyist who was fired as national security adviser after misleading the FBI and Vice President Mike Pence about conversations with Russian Ambassador Sergey Kislyak.

Rohrabacher, a Costa Mesa Republican, has made headlines for meetings with Russians and for advocating friendlier relations with the country.

Rohrabacher dismissed the report and called for a deeper look at a decision by the Obama administration to allow a Russian financial interest in U.S. uranium production. As secretary of state, Hillary Clinton sat on a committee that green-lighted the deal, although it’s unclear whether Clinton had any role in the decision.

“This is just another fake news attempt to divert attention away from the real Russian collusion story which is the sale of a significant portion of our nation’s uranium supply in exchange for contributions to the Clinton foundation and inflated speaking fees to Bill Clinton,” Rohrabacher said in an email to the Register.

Sources “could not confirm whether Rohrabacher and Flynn discussed U.S. policy towards Russia in the alleged meeting,” according to the NBC News report.

Rohrabacher is expected to face his toughest reelection bid next year. And two of the 15-term incumbent’s 48th Congressional District challengers, Democrats Hans Keirstead and Harley Rouda, wasted no time in attacking Rohrabacher for the meeting with Flynn.

“This alleged meeting is one of many occurrences that tie Rep. Rohrabacher to the Putin regime’s attempts to influence our government,” Keirstead said in a news release.

While Rohrabacher has acknowledged meetings with Russians and has disagreed with congressional colleagues’ hard-line approach toward the country, no evidence has emerged linking the congressman to Russian efforts to manipulate last year’s election. Rohrabacher, chairman of the Foreign Affairs Subcommittee Europe, Eurasia and Emerging Threats, brushed aside Keirstead’s attack.

“He clearly does not understand that I am the chairman of the congressional committee with specific responsibility for the oversight of American and Russian relations,” he said in his email. “As such, I meet with a wide variety of people with various approaches to America’s relations with Russia. While I have tried to find areas of cooperation, like defeating radical Islam, every decision I make is based on what’s good for and in the interests of the United States. Suggestions otherwise are based on either ignorance or politics.”

In his news release, Rouda said, “This is a really big deal…. The people of California’s 48th district deserve a full-time Congressman, not one distracted by legal problems.