An FBI informant with first hand experience in the Uranium One deal testified to congress that Moscow paid millions of dollars to a U.S. lobbying firm in order to influence then-Secretary of State Hillary Clinton by helping Bill Clinton’s charities during the Obama administration.

The informant, Douglas Campbell, gave a ten-page statement to the Senate Judiciary Committee, House Intelligence Committee, and House Oversight and Government Reform Committee, as well as being interviewed for several hours by committee staff.

According to Fox News, in the statement, Campbell stated that Russian executives told him that they were hiring APCO Worldwide in order to influence Hillary Clinton and the Obama Administration.

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In the statement, Campbell said that “the contract called for four payments of $750,000 over twelve months,” and that “APCO was expected to give assistance free of charge to the Clinton Global Initiative as part of their effort to create a favorable environment to ensure the Obama administration made affirmative decisions on everything from Uranium One to the US-Russia Civilian Nuclear Cooperation agreement.”

Subsequently, APCO did end up taking up client work on behalf of the Clinton Global Initiative from 2008-2016. APCO claims that those projects were “totally separate and unconnected in any way” to Uranium One.

Uranium One is a Canadian mining company whose sale to a Russian firm was approved in 2010. The sale, which had to be approved by the U.S. government, gave Russians control of a part of the U.S. uranium supply. The negotiation tactics from the Russians began to come under fire after FBI gained evidence that Russian operatives used bribes, kickbacks, and other dirty tactics to expand Russia’s atomic energy footprint in the U.S.

The testimony of Douglas Campbell has provided some of the most damning evidence proving corruption in the negotiations.