Former Vice President Joe Biden Joe BidenPelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Hillicon Valley: Subpoenas for Facebook, Google and Twitter on the cards | Wray rebuffs mail-in voting conspiracies | Reps. raise mass surveillance concerns Fox News poll: Biden ahead of Trump in Nevada, Pennsylvania and Ohio MORE predicted in an interview that aired Friday that the North Atlantic Treaty Organization (NATO) would cease to exist as we know it in if President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE is reelected.

"If he wins reelection, I promise you, there'll be no NATO in four years or five years," Biden told CNN's Chris Cuomo Chris CuomoCNN's Don Lemon: 'Blow up the entire system' remark taken out of context CNN's Lemon: 'We're going to have to blow up the entire system' if Democrats win back White House, Senate Giuliani criticizes NYC leadership: 'They're killing this city' MORE in the wide-ranging interview.

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"I went to the conference that we have, it's called the Wehrkunde Conference," the 2020 Democratic frontrunner continued. "The former chancellor of Germany stands up, she says we have to go it alone. We can't count on the United States."

"Why did we set up NATO, Chris? So no one nation could abuse the power in the region, in Europe, that would suck us in in the way that they did in World War One and World War Two. It's being crushed," he said.

Foreign policy has long been viewed as one of Biden's strengths. He has extensive experience in the area from working in the Obama administration, as well as serving as chairman of the Senate Foreign Relations Committee.

Biden pointed to Russia's growing influence in the west through election meddling and called out the country's President Vladimir Putin.

"While Putin is trying to undo our elections, he's undoing elections in Europe," he said. "Look what's happened in Hungary. Look what's happened in Poland. Look what's happened in Moldova. Look what's happening. Do you think that would happen on my watch or Barack's watch?"

Trump has repeatedly complained that international pacts, like NATO, have been unfair to Washington, saying that the U.S. has been forced to share a larger defense burden than most counties.

The president has argued that his tough rhetoric on NATO has resulted in concessions for the U.S. in the organization.