Sen. Chuck Grassley Charles (Chuck) Ernest GrassleySenate Republicans face tough decision on replacing Ginsburg What Senate Republicans have said about election-year Supreme Court vacancies Biden says Ginsburg successor should be picked by candidate who wins on Nov. 3 MORE (R-Iowa) demanded Saturday that President Trump Donald John TrumpUS reimposes UN sanctions on Iran amid increasing tensions Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Trump supporters chant 'Fill that seat' at North Carolina rally MORE tell Russian President Vladimir Putin to "butt out" of U.S. elections.

"The next time President Trump that you talk to Putin tell him to butt out of our elections quit the cyber warfare interference in our democracy," Grassley wrote on Twitter.

@realDonaldTrump The next time President Trump that you talk to Putin tell him to butt out of our elections quit the cyber warfare interference in our democracy — ChuckGrassley (@ChuckGrassley) February 17, 2018

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Grassley's tweet came after special counsel Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE unsealed indictments against 13 Russian nationals and three Russian entities on Friday for their alleged roles in an effort to disrupt and influence the 2016 presidential election.

The indictments were part of Mueller's investigation into Russia's role in the election — an investigation that Trump has rebuked as a "witch hunt" and a "hoax."

After the indictments were unsealed Friday, Deputy Attorney General Rod Rosenstein Rod RosensteinDOJ kept investigators from completing probe of Trump ties to Russia: report Five takeaways from final Senate Intel Russia report FBI officials hid copies of Russia probe documents fearing Trump interference: book MORE said that the allegations made in the documents did not suggest that any Americans were aware of the Russian efforts.

Trump claimed that the indictments exonerated him and his presidential campaign. Mueller is also investigating whether Trump or any of his associates conspired with the Russians to influence the election. That investigation, Bloomberg reported Friday, is ongoing.

Putin has denied that Moscow sought to disrupt the 2016 U.S. election.