Former Vice President Joe Biden Joe BidenOmar fires back at Trump over rally remarks: 'This is my country' Trump mocks Biden appearance, mask use ahead of first debate Trump attacks Omar for criticizing US: 'How did you do where you came from?' MORE offered some rare praise for President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE on Thursday after Trump abruptly ended a planned summit with North Korean leader Kim Jong Un.

"The president did the right thing by walking away," Biden said while speaking at the University of Nebraska, the Lincoln Journal-Star reported Thursday. "But diplomacy matters; preparation matters. The president treats everything like it's a real estate deal."

Biden added that he hopes that Trump "learned a very important lesson."

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Trump's negotiations with Kim ended abruptly on Thursday. Trump defended the Vietnam summit's collapse, saying, "Sometimes you have to walk."

“It was about the sanctions,” he said at a news conference. “Basically, they wanted the sanctions lifted in their entirety, and we couldn’t do that. They were willing to denuke a large portion of the areas we wanted, but we couldn’t give up all of the sanctions for that."

Biden is not the only Democrat to praise Trump's decision. Senate Minority Leader Charles Schumer Chuck SchumerSenate Democrats introduce legislation to probe politicization of pandemic response Schumer interrupted during live briefing by heckler: 'Stop lying to the people' Jacobin editor: Primarying Schumer would force him to fight Trump's SCOTUS nominee MORE (D-N.Y.) on Thursday also said he approved of Trump's decision while speaking on the Senate Floor.

Biden, meanwhile, appears to be gearing up for a 2020 presidential campaign. Two of Biden's advisers have been meeting with potential aides, The Hill reported Thursday Thursday. If he does announce a bid, he would be joining a crowded field for the Democratic nomination that includes Sens. Bernie Sanders Bernie SandersButtigieg stands in as Pence for Harris's debate practice Bernie Sanders warns of 'nightmare scenario' if Trump refuses election results Harris joins women's voter mobilization event also featuring Pelosi, Gloria Steinem, Jane Fonda MORE (I-Vt.), Kamala Harris Kamala HarrisButtigieg stands in as Pence for Harris's debate practice First presidential debate to cover coronavirus, Supreme Court Harris joins women's voter mobilization event also featuring Pelosi, Gloria Steinem, Jane Fonda MORE (D-Calif.) and Elizabeth Warren Elizabeth WarrenHarris joins women's voter mobilization event also featuring Pelosi, Gloria Steinem, Jane Fonda Judd Gregg: The Kamala threat — the Californiaization of America GOP set to release controversial Biden report MORE (D-Mass.).