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Mr. Moon said that Mr. Kim told him he wanted to go though with his planned summit meeting with Mr. Trump, and to make it a success. The Trump-Kim meeting, which would be the first between the heads of state of the United States and North Korea, had been scheduled for June 12 in Singapore, but was abruptly canceled on Thursday by Mr. Trump.

Mr. Trump said he was pulling out of the meeting, citing “tremendous anger and open hostility” from North Korea. But a day later, the American president said he was reconsidering and that it may still take place as scheduled.

Mr. Moon said the biggest challenge to holding the summit meeting was overcoming the lack of trust between North Korea and the United States, two countries that have viewed each other as threats since the end of the Korean War in 1953.

“Chairman Kim once again clearly expressed his firm commitment to a complete denuclearization of the Korean Peninsula,” Mr. Moon said. “What is not so clear to him is how firmly he can trust the United States’ commitment to ending hostile relations and providing security guarantees for his government should it denuclearize.”

Mr. Moon said that North Korea and the United States will soon start working-level talks to help narrow the gap between the two sides. He said the results of those talks will help determine whether a summit between Mr. Kim and Mr. Trump will take place and, if so, whether it will be successful.

President Trump on Sunday said the investigation into Russia's election interference has "destroyed" and "devastated" lives.

"Who's going to give back the young and beautiful lives (and others) that have been devastated and destroyed by the phony Russia Collusion Witch Hunt?" the president wrote on Twitter.

"They journeyed down to Washington, D.C., with stars in their eyes and wanting to help our nation...They went back home in tatters!"

The president did not specify whom he was referring to, but he has repeatedly referred to the Russia probe as a "witch hunt."

Trump has recently accused the FBI of using an informant to spy on his 2016 presidential campaign, though no evidence has emerged to support the president's assertion.

News reports show that an FBI informant met with three campaign advisors to Trump.

The president has also said the Russia investigation is an "excuse" for the Democrats' loss in the 2016 election.

"This whole Russia Probe is Rigged. Just an excuse as to why the Dems and Crooked Hillary lost the Election and States that haven't been lost in decades," Trump said Saturday.

"13 Angry Democrats, and all Dems if you include the people who worked for Obama for 8 years. #SPYGATE & CONFLICTS OF INTEREST!"

Who's going to give back the young and beautiful lives (and others) that have been devastated and destroyed by the phony Russia Collusion Witch Hunt?

.Later President Obama gave even more expensive reassurances to Iran and got nothing for that . (Its agent Hezbollah continued its operations throughout the Mideast and Iran continued its missile and weapons developments.)

How has the nuclear deal been implemented?

By most accounts, Iran has complied with its nuclear obligations under the deal. According to the State Department, Iran has put 19,000 centrifuges in storage and under international scrutiny. It has shipped out 98 percent of its low-enriched uranium. It has also opened up nuclear facilities to international inspectors.

The goal of this was to make sure Iran wouldn't be able to rush to develop a nuclear bomb. Before the deal went into effect, Iran was weeks or months away from having enough material for a bomb. Now, experts believe Iran is a year away from that. Critics worry that these restrictions are temporary and will mostly disappear after 10 to 15 years.

Trump's approach, combining severe sanctions and an offer to talk over the conditions for releasing them, is far more likely to deliver a favorable outcome than past, failed strategies.

Kim and his predecessors in North Korea are riding a tiger and they know it - It's hard to stay on in power, but even more dangerous to themselves to ever release it.