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Special Counsel Robert Mueller's probe into Russian interference in the 2016 election has turned its attention to an alleged meeting between former National Security Adviser Michael Flynn and pro-Russia Rep. Dana Rohrabacher (R-Calif.), NBC News reports. The meeting reportedly occurred in September 2016 and was also attended by Flynn's son, among other people.

As NBC notes, "Mueller's interest in the nature of Flynn and Rohrabacher's discussion marks the first known time a member of Congress could be wrapped into the investigation."

On Sunday, NBC News reported that Mueller already has enough evidence to indict Flynn, who resigned from his position as national security adviser less than a month into the Trump administration after apparently lying to Vice President Mike Pence about his contacts with Russia, and failing to register as an agent of the Turkish government.

For his part, Rohrabacher has long been viewed as a friend of Russia. In 2012, the FBI reportedly warned Rohrabacher that Russian spies were actively trying to recruit him. And in May, The Washington Post published audio of a conversation in which House Majority Leader Kevin McCarthy (R-Calif.) told Republican lawmakers, "There's two people I think Putin pays: Rohrabacher and Trump." A spokesman for McCarthy initially denied the exchange ever occurred, but eventually told the Post that it was "a failed attempt at humor."