Sen. Christopher Coons Christopher (Chris) Andrew CoonsMurkowski: Supreme Court nominee should not be taken up before election Battle lines drawn on precedent in Supreme Court fight Sunday shows - Ruth Bader Ginsburg's death dominates MORE (D-Del.) raised concerns on Sunday about what 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 might say to Russian President Vladimir Putin when the two leaders meet in Finland later this month.

"My concern is that he’ll continue to stir the pot with NATO, undermine our commitment to mutual security that is at the core of NATO and then go to Helsinki for a summit with Putin, where I’m very concerned about what things he might give away or what things he might say with Vladimir Putin, who really is a core adversary of both the United States and the NATO alliance," Coons said on CBS's "Face the Nation."

Sen. @ChrisCoons: I’m “very concerned” of things @POTUS might say or give away to Putin when they meet in Helsinki pic.twitter.com/IRmVNtEzEg — Face The Nation (@FaceTheNation) July 8, 2018

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Trump is set to meet with Putin on July 16, days after he attends the annual NATO summit in Brussels with some of the closest U.S. allies.

The back-to-back summits have raised concerns among some foreign leaders and U.S. lawmakers that Trump could seek a repeat of the Group of Seven summit in Canada last month, when he showed up late to the gathering, sharply criticized U.S. allies and left early to fly to Singapore for a summit with North Korean leader Kim Jong Un.

Trump has long blamed NATO members for placing too much of a burden on the U.S. to pay for Europe's defense — a line he has repeated in recent days.

The Washington Post reported on Friday that Trump has told advisers that he could seek to cut funding on Europe's defense if NATO members do not step up their own military and defense spending.

Trump has also spoken fondly of Putin, despite concerns from U.S. officials and NATO allies over Moscow's destabilizing activities, such as its 2014 annexation of Crimea and its military involvement in eastern Ukraine.

At a rally in Montana last Thursday, Trump waved off concerns about Putin's past career as a Russian intelligence officer, saying the leader is "fine."