Judicial Watch President Tom Fitton said Tuesday one must wonder how many donations were made by Russian connections to Hillary Clinton, basing his comments on a leaked email from her campaign concerning a story that was killed on the matter.

"[There were] connections between all this Russian-connected money, $145 million generally, $500,000 specifically to Bill Clinton from a Russian-connected firm that was pushing Uranium One," Fitton told Fox News' "Fox & Friends" program.

"Evidently, someone in the media not only connected it to Uranium One, but saw other Russian interests being advanced by Mrs. Clinton, such as this really hard-core opposition to any new sanctions against Russia over its alleged murder of a human rights-related lawyer. "

The international mining company, whose headquarters are in Canada, had U.S. mines that produced about 11 percent of the country's uranium production in 2014, Politifact reports, quoting figures from Oilprice.com

Fox News' Brian Kilmeade commented that the leaked email, sent by a Clinton spokesperson, said that "with the help of the research team, we killed a Bloomberg story trying to link Hillary Rodham Clinton to a $500,000 speech that Bill Clinton gave in Moscow."

Kilmeade alleged that it was a series of examples of how Clinton and former Secretary of State John Kerry were trying to end the Magnitsky Act, a set of sanctions stemming from the death of Russian lawyer Sergei Magnitsky, who was killed after testifying against Russian interests in a fraud case.

The bill's name came up over the last month following revelations about Donald Trump Jr.'s meetings with Russian attorney Natalia Veselnitskaya, who represents clients fighting back against the sanctions.

"Hillary Clinton and Vladimir Putin were on the same side," Kilmeade insisted. "But if this was linked to a $500,000 speech, how would that look to Hillary Clinton's candidacy?"

Fitton said such a revelation would "look tough."

"You have to wonder how many other donations were made by Russian connection entities we don't know about," he said. "You may recall the Clinton Foundation had to fix its [reports] to expose or highlight contributions that it had promise to publicize, but it hadn't publicized."

Fitton continued he could not "overemphasize the nature" of the conflict of interest with Clinton, "her husband getting a half a million dollars directly from the Russians while she was secretary of state."

"We were astonished when we saw that the State Department, we got the document, approved this ethics process that allowed this speech," said Fitton. "Why would the Clinton State Department allow Hillary Clinton's husband to get a half a million dollars from the Russian-connected entity?

"I can't imagine if the spouse of Rex Tillerson or the spouse of any other cabinet official got a half a million dollars from a foreign government while that official was in office."

And that official, he continued, was Clinton, who was "advocating on behalf of Russian interests not only on Uranium One, which saw the Russians get 20 percent of our uranium operations, but then pushed hard for the Russians against the sanctions."

Politifact and other sources have largely disputed the Uranium One claims, however, noting that in 2010, Clinton was one of nine federal agency heads signing off on the purchase of a controlling stake in Uranium One, which has operations in several states, and President Barack Obama had the final say in the matter.

However, even though it controls Uranium One, Russia can't export uranium from the United States, and is more likely interested in the company's assets in Kazakhstan, which produces the bulk of the world's uranium, Politifact reports.

Politifact also discounted the claims on Bill Clinton's speech, noting that Renaissance Capital paid him $500,000 to deliver it in 2010, at a time when his speech fees were normally that amount or higher.

It also reports that other world leaders are often invited to speak at Renaissance Capital events, such as former British Prime Minister Tony Blair and ex-Secretary of State Colin Powell.