So far, no hard evidence has emerged that says Donald Trump knowingly colluded with Russia during the 2016 campaign.

But there is plenty of evidence in the form of a tangible money trail that links Vladimir Putin’s Russian government with U.S. environmental groups. In fact, the source of this funding has been subject of two congressional committee inquiries. Most recently, Rep. Lamar Smith, R-Texas, who chairs the House Science, Space, and Technology Committee, released a report in March that explores Russia’s motives for disrupting America’s energy sector.