Sen. Mark Warner Mark Robert WarnerDemocrats call for declassifying election threats after briefing by Trump officials It's time to upgrade benefits Intelligence chief says Congress will get some in-person election security briefings MORE (D-Va.), the ranking member of the Senate Intelligence Committee, said on Friday that President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE should not meet one-on-one with Russian President Vladimir Putin.

"There should be no one-on-one meeting between this president and Mr. Putin. There needs to be other Americans in the room," Warner told reporters.

Warner's comments come after 12 Russian intelligence officers were indicted in the 2016 hacking of the Democratic National Committee (DNC).

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Warner added that Trump should cancel the meeting if he isn't willing to make Friday's indictment a "top priority" for his closed-door sit-down with Putin.

"Secondly, if the president and his team are not willing to make the facts of this indictment a top priority of the meeting in Helsinki then the summit should be canceled," Warner told reporters.

The indictment comes three days before Trump is scheduled to meet with his Russian counterpart. The meeting has sparked concerns from top lawmakers, as well as European allies, that Trump could agree to major concessions following his warmer tone toward Moscow since announcing his bid for president.

Pressed on Friday about why he thought the two men shouldn't meet one-one-on, Warner admitted that he had been concerned for a while that Trump's "ad hoc style" and "going into meetings and winging it isn't appropriate."

"I'm afraid that actually the president could be taken advantage of," Warner told reporters.

Other Democrats, including Minority Leader Charles Schumer Chuck SchumerCruz blocks amended resolution honoring Ginsburg over language about her dying wish Senate Democrats introduce legislation to probe politicization of pandemic response Schumer interrupted during live briefing by heckler: 'Stop lying to the people' MORE (D-N.Y.), have issued a blanket demand that Trump cancel the meeting with Putin.

"Trump should cancel his meeting with Vladimir Putin until Russia takes demonstrable and transparent steps to prove that they won’t interfere in future elections," Schumer said in a statement.

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, who announced the indictment, told reporters on Friday that Trump had been briefed on the issue earlier this week.

Trump separately promised on Friday, before Rosenstein's press conference, that he would "firmly ask the question" about election interference in his meeting with Putin.