Although Hillary Clinton was not mentioned by name, the letters reflect unsubstantiated allegations by U.S. President Donald Trump, Republican lawmakers, and right-wing media that the 2016 Democratic nominee masterminded the approval of the sale in return for donations to the Clinton Foundation.
But as Fox News's Shepard Smith explained in his show on Wednesday, it's an impossible accusation to levy because Clinton could never have unilaterally made the decision to allow for the sale of the company.
In his segment, Smith then stated what the allegations against Clinton were.
Those pedalling the theory say that nine people involved in the deal made donations to the Clinton Foundation totalling more than $140 million.
The accusation was first made by Peter Schweizer, the senior editor-at-large of the far-right website Breitbart, in his 2015 book Clinton Cash. "The next year, candidate Donald Trump cited the accusation as an example of Clinton corruption".
Hillary Rodham Clinton delivers keynote during the Geisinger National Symposium, "From Crisis to Cure: Revitalizing America's Healthcare System", on November 9, 2017 in Danville, Pennsylvania.
"If [the Trump administration] sends a signal that we're going to be like some dictatorship ― some authoritarian regime ― where political opponents are going to be unfairly, fraudulently investigated, that rips at the fabric of the contract we have, that we can trust our justice system", she continued.
In an interview with Mother Jones, Clinton directly confronted the idea, which she said, if carried out, would oppose the American values that she promoted when she was Secretary of State. If there was nothing to hide, why rebuff an examination into her ties to Russian Federation?
Fox News viewers attacked Smith, suggesting he should work for another network.
"Get Shepard Smith off of Fox", one Twitter user wrote.
Smith has been getting some criticism for his comments, though, with angry viewers tweeting that he's part of a left-wing conspiracy, the Post reports.
In an opinion piece for Fox News this week, members of the hard-right House Freedom Caucus called for Attorney General Jeff Sessions to investigate Clinton or "step down".
A number of Republican lawmakers have called to form a special counsel to look into the connection between the Clinton Foundation donations and the State Department approving a deal alongside President Barack Obama's administration, which authorized a Russian company to buy a uranium mining group from Canada that primarily works out the the USA, notes The Washington Post.
During a private meeting with Trump in the Oval Office on November 1, Fox News host Jeanine Pirro insisted he should appoint a special counsel to investigate Hillary Clinton, according to The New York Times.