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Sen. Chuck Grassley (R-IA), chairman of the Senate Judiciary Committee, is calling for the appointment of a special counsel to investigate the Obama-era Uranium One deal.

Uranium One refers to the name of a Canada-based company with mines in the U.S. that was bought by Rosatom, a company backed by the Russian state. The State Department, then led by Hillary Clinton, was one of nine U.S. government agencies that had to approve the controversial 2010 deal, which gave Russia control over more than 20 percent of U.S. uranium supplies.

Republicans have raised concerns about Russian efforts to influence Clinton to sign off on the deal – citing donations to the Clinton Foundation as well as a $500,000 speaking fee received by former President Bill Clinton.

On "Fox & Friends," Grassley said that if a special counsel was necessary to investigate Russian meddling in the 2016 election, then one is also necessary to look into these "potentially criminal, fraudulent money laundering activities."

He said he's looking forward to hearing from a former FBI informant, who claims to have information about efforts to bribe the Clintons involving the uranium deal.

The Justice Department said Wednesday night that it had lifted a gag order the informant, clearing the individual to speak to Congress.

“We ought to know about [what he knows], because transparency brings accountability,” Grassley said, explaining that it's possible that there has been some kind of "cover up" in the bureaucracy at the Justice Department or FBI.

"Could there be a cover-up? I don't have an answer for it yet. But we have found that to be a practice throughout bureaucracies under Republicans or Democrats," Grassley said.

Watch more above.

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