Senate 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.) on Tuesday expressed concerns about 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 meeting one-on-one with Russian President Vladimir Putin, saying he is "afraid" of what deal Trump might agree to in the sit-down.

Schumer, speaking to reporters, argued that when Trump met with Chinese President Xi Jinping and North Korean leader Kim Jong Un they "took him to the cleaners." A meeting with Putin, Schumer warned, could result in even bigger concessions.

"It's even worse for him to meet with a very, very clever, out-for-himself man like President Putin alone. And I am very much afraid what he would give away without any advisers to keep him in check," Schumer told reporters.

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Trump is scheduled to meet Putin early next week in Helsinki after a trip this week to Brussels for the NATO summit and a visit to the United Kingdom.

The meeting with Putin has sparked concerns from U.S. allies, as well as lawmakers on Capitol Hill, that Trump could strike a deal that would include too many concessions to Moscow while antagonizing Europe.

The Senate held a nonbinding vote on Tuesday evening to instruct lawmakers hashing out a national defense policy bill to use the conference committee to "reaffirm" the U.S. commitment to NATO.

Schumer, in a separate floor speech, added that Trump should use the summit in Brussels to "reinforce and build up the trans-Atlantic alliance rather than tearing it down."