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The NRA was the largest single contributor to Trump’s campaign. Their $30 million contribution was almost 10 percent of all the money that Trump raised. That contribution seems to match a surprising jump in the NRA’s own revenues.

The NRA’s tax return for the election year of 2016 showed a surge in contributions and grants to $124.4 million, compared with $95 million the prior year.

The NRA got $30 million more in 2016 … and fed $30 million out to Trump. But, as a non-profit, the NRA isn’t required to describe the source of all its funding. Around $19 million seems to have come from memberships and member contributions. That leaves a lot of funds left to explain—and at least one NRA board member with some worries.

Congressional investigators have learned that a longtime attorney for the National Rifle Association expressed concerns about the group’s ties to Russia and possible involvement in channeling Russian money into the 2016 elections to help Donald Trump, two sources familiar with the matter say.

Attorney Cleta Mitchell was on the list of people who Democrats wanted to appear before the House Intelligence Committee—one of the over fifty people who Devin Nunes refused to bring in. Safely free of the threat to testify, Mitchell denies that she ever had an issue. But there’s a good reason to worry. A good reason to think that the NRA didn’t get a $30 million contribution bump, so much as it provided a $30 million pipeline to bring Russian money to Donald Trump.

In January, the NRA was drawn into the furor over Russian interference in the election when McClatchy reported that the FBI was investigating whether Russian banker and “lifetime” NRA member Alexander Torshin, who hosted a high-level NRA delegation in Moscow in late 2015, funneled funds to the NRA to help Trump.

Which would be a problem for both the NRA and Trump.