Democrats on Thursday mocked President Donald Trump for his 'amateur hour' after the second North Korea summit ended early and Speaker Nancy Pelosi touted Kim Jong Un as the 'big winner' for getting the president to sit down and negotiate.

'I guess it took two meetings for him to realize that Kim Jong Un is not on the level,' Pelosi told reporters of the president in the Capitol Thursday.

'He was a big winner, Kim Jong Un, in getting to sit face-to-face with the most powerful person in the world - the president of the United States,' she added.

Speaker Nancy Pelosi praised Kim Jong Un as the 'big winner' in the North Korea talks just for getting President Trump to sit down and negotiate

Donald Trump left his second summit with North Korean dictator Kim Jong-un empty handed after the U.S. president decided to 'walk away' from talks without so much as a framework for a treaty

Other Democrats slammed the president for his naivety in expecting results from the North Korean dictator.

Senior New Jersey Senator Robert Menendez characterized the two-day summit in Vietnam as 'amateur hour with nuclear weapons.'

'You don't put yourself in this position in the first place and I think that's one of the critical short failings,' he said on CNN.

Trump left his second summit empty handed after the U.S. president decided to 'walk away' from talks without so much as a framework for a treaty regarding denuclearization on the Korean Peninsula.

He explained at his news conference that Kim wanted to give up some of his nukes in exchange for the lifting of economic sanctions, but he would not agree to certain sites the U.S. is demanding.

'We had to walk away from that particular suggestion,' he acknowledged.

Pelosi praised the president for walking away from a bad deal.

'Really it's good that the president did not give him anything for the little that he was proposing,' she said.

Other Democratic lawmakers said they were not surprised that the Republican president - whose claim to fame is his deal-making skills - could not get Kim to agree the United States' preconditions for sanctions relief.

They called the summit a 'failure' and the president who orchestrated it 'naive' for believing that the authoritarian leader would ever hand over his nuclear arsenal.

Democratic lawmakers said they were not surprised that the Republican president - whose claim to fame is his deal-making skills - could not get Kim to agree the United States' preconditions for sanctions relief

'I'm not surprised it ended in failure. Trump just does not know what he's doing,' Congressman Brendan Boyle told DailyMail.com. 'We have gotten absolutely nothing out of these two bilateral summits, other than a photo op.'

Even though a third summit is not planned for this time, after talks in Hanoi ended with the U.S. nixing a publicly-advertised signing ceremony for a document that never emerged, Trump said that the two sides agreed to keep the conversation going.

Kim verbally promised not to conduct any additional nuclear tests, Trump told reporters. He personally committed to the indefinite suspension of joint United States and South Korean military drills.

Trump pitched the military drawback as his preference, however. 'Those exercises are very expensive,' he stated.

Prior to the summit a U.S. official indicated that the Trump administration had also relaxed a request that North Korea hand over a complete inventory of both its nuclear and missile sites in order for an accord to be reached.

Trump, at a news conference, explained that Kim wanted to give up some, but not all, of his nukes in exchange for the lifting of economic sanctions, 'So we continue to work, and we'll see. But we had to walk away from that particular suggestion'

Congressman Ruben Gallego, a member on the House Armed Services Committee, said the administration is either 'naive or so desperate for a deal' that it was willing to offer North Korea 'something for nothing' to get to this point in talks.

'North Korea does not intend to denuclearize,' he told DailyMail.com. 'It shows either the administration is naive or so desperate for a deal that they would go down this path.'

Trump suggested at a press conference that followed the summit that he may have been willing to lift some sanctions if Kim had agreed to dismantle key facilities.

'But they weren't willing to do an area that we wanted. They were willing to give us areas but not the ones we wanted,' he explained.

Kim offered areas 'that are less important than the areas that we want' and that was the hold up.

Trump declined to recommit to complete, irreversible, verifiable denuclearization, further signaling a softening of his views.

Rep. Jim Clyburn, the number three House Democrat, told DailyMail.com as Trump flew back to the United States: 'I don't think anybody expected the president to get a deal out of that. I don't know what he was thinking.'

Some legislators signaled relief that Trump had walked away, knowing what was on the table.

'In some ways this might be the best possible realistic outcome from my perspective because I was nervous President Trump would make an agreement that would be far worse than just a failed summit,' Boyle said.

One Democratic lawmaker, who asked to speak to the DailyMail.com on background, said,' I guess no deal is better than a bad deal.'

The lawmaker added what really concerned him were the president's comments on Otto Warmbier, the American student sent to a work camp who came back to the U.S. in a comma and died several days later.

'I was blown away by the president's quote about Otto Warmbier. That the president would defend Kim Jong-un and his regime I thought was incredible,' the lawmaker said.

The member of Congress said the second summit did not help Trump's reputation as a deal maker.

'I think he really hasn't done a deal with anybody,' the lawmaker said, adding: 'He tries to do things on his own. He's not really a deal maker. At least he hasn't shown that in politics.'