Special counsel Robert Mueller's team is investigating a meeting between President Trump Donald John TrumpUS reimposes UN sanctions on Iran amid increasing tensions Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Trump supporters chant 'Fill that seat' at North Carolina rally MORE's former national security adviser Michael Flynn and Rep. Dana Rohrabacher (R-Calif.), who has expressed pro-Russia views on a number of policies, according to NBC News.

Mueller's team is reportedly looking at emails sent from Flynn's lobbying group to Rohrabacher thanking the congressman for his role in the meeting.

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NBC reports the meeting between Flynn and the congressman took place in Washington, D.C., on Sept. 20, 2016, while Flynn was working as an adviser to the Trump campaign.

The meeting was reportedly organized by Flynn's lobbying group the Flynn Intel Group, and was also attended by Flynn's son Michael G. Flynn, as well as his business partners Bijan Kian and Brian McCauley.

Rohrabacher has shown sympathetic views toward Moscow in the past. It was revealed in October that the congressman even met with Russian lawyer Natalia Veselnitskaya two months after she met with Donald Trump Jr. in June 2016.

The congressman discussed U.S. sanctions against Russia in response to human rights abuses with Veselnitskaya.

Veselnitskaya lobbied against the punitive measure, known as the Magnitsky Act.

Flynn and his son are currently under investigation in Mueller's probe into alleged ties between the Trump campaign and Russian election meddling.

Updated at 1:51 p.m.