A Democratic senator on Thursday disputed President Trump’s claim that the Russia probe was the “single greatest witch hunt” in American history, arguing the Salem witch trials of the 17th century were worse.

“I have family ancestors from the Boston area and I think the Salem witch hunt has to be the greatest witch hunt in American history,” Sen. Chris Coons Christopher (Chris) Andrew CoonsMurkowski: Supreme Court nominee should not be taken up before election Battle lines drawn on precedent in Supreme Court fight Sunday shows - Ruth Bader Ginsburg's death dominates MORE (D-Del.) told CNN's "The Situation Room with Wolf Blitzer."

Coons’s comment came hours after Trump called the investigation into Russia’s meddling in the 2016 presidential election and possible ties between his campaign staff and Russia the “single greatest WITCH HUNT in American political history.”

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“They made up a phony collusion with the Russians story, found zero proof, so now they go for obstruction of justice on the phony story. Nice,” Trump wrote on Twitter.

“You are witnessing the single greatest WITCH HUNT in American political history - led by some very bad and conflicted people!" Trump wrote, adding a hashtag for his "Make America Great Again" slogan.

Coons in the television appearance argued that it will be difficult for Trump to “change the subject” from the FBI’s Russia investigation because special counsel Robert Mueller has bipartisan support.

“One of the things that President Trump is going to run into here as he tries to change the subject is the fact that Bob Mueller commands very wide bipartisan support here in the senate and in Washington generally,” Coons said.

The Democratic senator noted that Mueller, who led the FBI under former Presidents George W. Bush and Barack Obama Barack Hussein ObamaObama warns of a 'decade of unfair, partisan gerrymandering' in call to look at down-ballot races Quinnipiac polls show Trump leading Biden in Texas, deadlocked race in Ohio Poll: Trump opens up 6-point lead over Biden in Iowa MORE, was “one of the most respected federal law enforcement leaders.”

“And although he may try to change the subject to Hillary Clinton Hillary Diane Rodham ClintonFox News poll: Biden ahead of Trump in Nevada, Pennsylvania and Ohio Trump, Biden court Black business owners in final election sprint The power of incumbency: How Trump is using the Oval Office to win reelection MORE and the investigation into her emails during last year’s campaign, the fact that there is a significant investigation moving forward lead by former FBI Director Mueller, is what I would encourage the president to focus on,” Coons said.

Trump on Thursday afternoon also questioned why former Democratic presidential nominee Hillary Clinton was not the subject of Russia-related investigations.