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The Federal Election Commission has launched an inquiry into potential illegal donations made to the National Rifle Association by Russian individuals and businesses in support of President Donald Trump’s 2016 campaign, according to Politico.

The revelation comes a month after Sen. Ron Wyden (D-Ore.) sought answers and relevant records in a letter to the NRA: “I am specifically troubled by the possibility that Russian-backed shell companies or intermediaries may have circumvented laws designed to prohibit foreign meddling in our elections,” Wyden wrote.

Politico, which first revealed the existence of the FEC investigation late on Friday evening, says the commission is examining similar issues to Wyden’s probe. The senator’s inquiry focuses on Alexander Torshin, a Russian central bank official with close ties to Russian president Vladimir Putin, and his contributions to the NRA. In January, McClatchy reported that the FBI was investigating Torshin’s contributions. In response to Wyden’s letter, NRA general counsel John Frazer denied the NRA had accepted donations from foreign entities during US elections. The NRA spent a striking $30 million to support Trump’s 2016 campaign.

As Mother Jones previously reported, social media posts from Torshin and Siberian gun rights activist Maria Butina show longstanding ties between the pair, the NRA, and various conservative heavyweights. Mother Jones‘s Mark Follman and Denise Clifton recently wrote an article laying out the duo’s history: