An informant for the Federal Bureau of Investigation (FBI) is under a gag order that prevents him from testifying before the United States Congress that Russian nuclear officials were involved in fraudulent dealings in 2009 before the Uranium One deal was approved.

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Former Attorney General Loretta Lynch blocked the informant from testifying last year and threatened criminal action against him if he were to do so.

In an interview with FOX Business’ Lou Dobbs, Victoria Toensing, the attorney representing the FBI informant, said she has never heard of a criminal penalty for breaching a non-disclosure agreement (NDA).

“If it does and it is unconstitutional and it’s invalid, if it prohibits my client from giving information to the legislature, the executive cannot say to people, ‘Hey, you can’t give information to another body of the government,’” Toensing said.

The former Reagan Justice Department official and former chief counsel of the Senate Intelligence Committee said the impact of her client’s knowledge of the Russians’ ability to use the Clintons’ position of power is significant.

“He can tell what all the Russians were talking about during the time that all these bribery payments were made,” Toensing said on “Lou Dobbs Tonight.”

The House Oversight Committee is investigating the Obama-era Uranium One deal, and Rep. Ron DeSantis (R-Florida) is calling for the Justice Department to remove the NDA that prevents the former FBI informant from testifying.

“We are glad Ron DeSantis is doing it because he is a former federal prosecutor, and he is a go-getter on this and I think he’ll do a great job,” Toensing said.