Sen. Jeff Flake Jeffrey (Jeff) Lane FlakeHow fast population growth made Arizona a swing state Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Republican former Michigan governor says he's voting for Biden MORE (R-Ariz.), a member of the Senate Foreign Relations Committee, says the White House needs to explain what, if any deal, was agreed to privately with Russian President Vladimir Putin during a summit in Finland.

“The White House has better get out in front of this because the Russians are talking about it, and they’re going to start characterizing it among their partisans,” Flake said. “They’re going to define it before we do. And the problem is there’s so little trust of our president now among our allies.”

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Flake at this point does not support a push by Democrats to subpoena the American translator who was present for 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 one-on-one meeting with Putin in Helsinki.

“Hopefully it doesn’t come to that. It shouldn’t,” he said.

But Flake, a frequent Trump critic, said he backs a demand by 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.) that the White House turn over the interpreter's contemporaneous notes of that meeting.

“I would hope that those notes — all interpreters take notes — would be turned over,” he said. “We need to know.

Russian envoy Anatoly Antonov has claimed that Trump and Putin reached “important verbal agreements” during the summit, a claim that caught some U.S. officials by surprise.

Antonov says the leaders reached agreement on issues related to Syria and arms control, according to The Washington Post.

“We’ve got to find out what the Russian ambassador was referring to yesterday when he said that important agreements were reached. We don’t know. We have no idea. We’ve got to find that out,” Flake said.

Flake worries that Russia may be trying to claim secret deals in an effort to undermine relations between the United States and NATO allies.

“Russia is going to play this game. They’re already out there talking about important agreements being reached and they will over the next while characterize those agreements in they way that they want to,” he said.