On Sunday, Trump said he and Kim had agreed to “work out some details” around negotiations over North Korea’s nuclear program. Trump has insisted his relationship with Kim has grown stronger, even after their second summit in Hanoi four months ago broke down.

“Nobody knows how things turn out, but certainly this was a great day,” Trump said after talks with Kim. “This was a very legendary, very historic day.”

Democratic president hopefuls dubbed the meeting “a photo op” and said it was much too soon to tell whether the talks will prompt meaningful political change. Summits with foreign leaders typically require advance staff work and preparations, they argued — not haphazard meetings with few concrete terms set in advance. Trump initially promoted his offer to meet with Kim at the border in a tweet while at the Group of 20 summit in Japan on Saturday morning.

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“We’ve seen a history where Trump announces a summit and nothing really comes of it,” Sen. Amy Klobuchar (D-Minn.) said on CNN’s “State of the Union.” “It’s not as easy as just going and bringing a hot dish over the fence to the dictator next door.”

Julián Castro, a former housing secretary, said North Korea has not kept its promise from last year’s summit in Singapore to produce a detailed account of its nuclear weapons stockpile.

“I’m not quite sure why this president is so bent on elevating the profile of a dictator,” Castro told CNN.

“It’s all symbolism, it’s not substance,” he added.

Like his fellow candidates, Sen. Bernie Sanders (I-Vt.) said that there was nothing inherently wrong with Trump sitting down with Kim, and that he would even like to see Trump meet with the leaders of Saudi Arabia and Iran. But once he’s at the table, Trump needs to push for more specifics, Sanders said.

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“What’s going to happen tomorrow or the next day?” Sanders said on ABC’s “This Week.” “We need to move forward diplomatically.”

Former congressman Beto O’Rourke (D-Tex.) also criticized Trump’s handling of North Korea, saying on CBS’s “Face the Nation” that Kim’s dictatorship has not removed any of its nuclear weapons “or their attempt to deliver them to the U.S.”

O’Rourke said that if he was elected president, he would “continue diplomacy contingent on progress.”

“Despite three years of almost bizarre foreign policy from this president, this country is no safer when it comes to North Korea,” O’Rourke said.

In a statement, former vice president Joe Biden attacked Trump for “coddling” Kim “at the expense of American national security and interests.”