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 said Tuesday he received a “beautiful” letter from North Korean leader Kim Jong Un Kim Jong UnPelosi knocks Trump over refusal to commit to peaceful transfer of power Satellite images indicate North Korea preparing for massive military parade South Korea warns of underwater missile test launch by North Korea MORE amid their apparent impasse on nuclear talks.

Trump called the letter “very warm” and “very nice” and expressed confidence the two sides could eventually reach an agreement.

“We have a very good relationship together," Trump told reporters as he departed the White House for a trip to Iowa.

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The president added that another meeting could take place, but that Kim has "kept his word" and "that's very important to me."

Trump is set to travel to Asia later this month. He will attend the Group of 20 Summit in Osaka, Japan, and meet with South Korean President Moon Jae-in.

Negotiations over the denuclearization of the Korean peninsula have hit a standstill after Trump and Kim's second face-to-face summit ended abruptly and without a formal agreement earlier this year.

In the time since, North Korea has resumed testing of short-range missiles, prompting allies to question whether Kim is interested in re-engaging with the U.S. on denuclearization talks.

National security adviser John Bolton John BoltonJudge appears skeptical of Bolton's defense of publishing book without White House approval Maximum pressure is keeping US troops in Iraq and Syria Woodward book trails Bolton, Mary Trump in first-week sales MORE and U.S. allies have said the short-range missile tests violated a United Nations Security Council resolution, but Trump has publicly said he's not bothered by the launches.

The president has repeatedly offered praise for Kim, calling him a "very smart man" and touting their personal relationship.