Republican Sen. Roy Blunt Roy Dean BluntSenate to push funding bill vote up against shutdown deadline Social media platforms put muscle into National Voter Registration Day Senate GOP faces pivotal moment on pick for Supreme Court MORE (Mo.) said Friday that President Trump needs to "stop talking" about the investigation into whether members of his campaign colluded with Russia during the 2016 election.

"Frankly, I think the president should stop talking about it," Blunt told KMBZ local radio in an interview first highlighted by CNN. "I think the president needs to get on with the work that is so important that he do and at this point now let this investigation run its course."

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Blunt, who serves on the Senate Intelligence Committee, argued that his panel was the best suited to getting the facts straight on Russia's interference in the 2016 presidential election.

"I think what we need to do is get all the facts out there," Blunt said. "I believe that the president will be better served - I know the country will be served by that."

Trump tweeted again early Friday, calling the FBI's Russia investigation a "witch hunt" while lashing out and saying that he was being personally investigated over his firing of FBI Director James Comey last month.

Comey was leading the Russia probe before he was ousted, and Trump's tweet blasting "the man who told me to fire" Comey appeared to be a reference to Deputy Attorney General Rod Rosenstein.

"I am being investigated for firing the FBI Director by the man who told me to fire the FBI Director! Witch hunt," Trump wrote.