Fox News host Sean Hannity accidentally referred to Hillary Clinton Hillary Diane Rodham ClintonJoe Biden looks to expand election battleground into Trump country Biden leads Trump by 12 points among Catholic voters: poll The Hill's Campaign Report: Biden goes on offense MORE as the president during the opening monologue of his show Monday night.

Hannity was discussing an Obama-era uranium deal with Russia when he made the mistake.

“What did President Clinton, or President Clinton wannabe, President Obama, or key members of the Obama administration, what did they know about the Uranium One deal?” Hannity said on his eponymous talk show.

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Hannity claimed during the monologue that the reported Uranium One sale was more important than the charges filed against former Trump campaign chairman Paul Manafort and other former campaign staffers earlier Monday.

Uranium One, which supplies a portion of the United States' uranium stockpile, was purchased by a subsidiary of a Russian state-owned energy company in 2010.

The sale was subject to the approval of the U.S. Committee on Foreign Investment, of which Clinton, as secretary of State at the time, was a member.

The Senate Judiciary Committee announced last week that it was opening an inquiry into the sale.