Secretary of State Mike Pompeo Michael (Mike) Richard PompeoTreasury sanctions individuals, groups tied to Russian malign influence activities Navalny released from hospital after suspected poisoning Overnight Defense: Pentagon redirects pandemic funding to defense contractors | US planning for full Afghanistan withdrawal by May | Anti-Trump GOP group puts ads in military papers MORE must warn Russian President Vladimir Putin Vladimir Vladimirovich PutinNavalny released from hospital after suspected poisoning Ex-Trump national security adviser says US leaders 'making it easy for Putin' to meddle The Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting MORE against meddling in the upcoming 2020 presidential election, Senate Minority Leader Chuck 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.) urged on Sunday.

“During your meeting with Vladimir Putin, it is critical that you warn him that any action to interfere in our elections will be met with an immediate and robust response,” Schumer wrote in a letter to Pompeo.

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“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’s approach to dealing with President Putin, especially on this vital issue, must change. I urge you to make absolutely clear to President Putin that interference in U.S. elections will not be tolerated.”

Pompeo is set to meet with Putin on Tuesday, the first major meeting of an administration official and the Russian president since the release of 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’s report, which documented extensive Russian efforts to disrupt and interfere in the 2016 election.

FBI Director Christopher Wray has also warned that the U.S. government should be prepared for another attack on American election systems in 2020.

“In recent weeks, the American people have heard yet again that Vladimir Putin directed a ‘sweeping and systematic’ attack on our democracy,” Schumer wrote.

“Even more recently, FBI Director Christopher Wray told the American people that the Russian efforts in the 2018 elections were just a dress rehearsal for 2020 and that we should be prepared for another active measures campaign to attack our election systems. Director Wray’s remarks should send a chill down all of our spines.”

Schumer last week was critical of Trump over his call with Putin after Trump said the two did not discuss Moscow’s efforts to interfere in U.S. elections.

"Instead of pressing Putin on the #MuellerReport's extensive evidence that Russia hacked our elections, They gossiped about Fox News conspiracy theories?" Schumer tweeted Friday night. "Trump’s priorities are appalling and undermine democracy."

Trump has routinely appeared skeptical of the intelligence community’s unanimous consensus that Moscow interfered in the 2016 race.