The White House said Thursday that President Donald Trump received a new letter from North Korean leader Kim Jong Un following up on their Singapore summit. The correspondence came amid fresh concerns over Pyongyang鈥檚 commitment to denuclearization.

Trump tweeted early Thursday his thanks to the North Korean leader 鈥渇or your nice letter 鈥� I look forward to seeing you soon!鈥�

The White House did not provide details on the specific content of the letter, which was received Wednesday. White House spokeswoman Sarah Huckabee Sanders said the correspondence was 鈥渁imed at following up on their meeting in Singapore and advancing the commitments made in the US-DPRK joint statement.鈥�

A second meeting between Trump and Kim has not been planned at this time, according to a person familiar with the process. The person was not authorized to speak publicly and spoke on condition of anonymity to describe internal planning.

Trump in his tweet expressed gratitude to Kim 鈥渇or keeping your word鈥� on the return of the remains of more than 50 Americans service members killed during the Korean War. Vice-President Mike Pence and U.S. military leaders received the remains in Hawaii during a sombre ceremony on Wednesday.

The latest letter from Kim arrived on the heels of concerns over North Korea鈥檚 ballistic missile program and commitment to denuclearization. Senior Trump administration officials have urged patience, cautioning that the process of denuclearizing North Korea and removing the threat of its long-range missiles will take time.

Secretary of State Mike Pompeo was headed to an Asian security meeting in Singapore, where a meeting this weekend with North Korea鈥檚 foreign minister was possible.

Trump has sought to show progress from his June 12 summit with Kim in Singapore. He said during a Tuesday rally in Tampa, Florida, that the U.S. was 鈥渄oing well鈥� with North Korea and noted the return of detained Americans and Pyongyang鈥檚 ceasing of nuclear testing or missile tests. 鈥淎 lot of good things are happening. No tests. No rockets flying. But we鈥檒l see what happens,鈥� Trump said.

U.S. officials have been closely watching North Korea鈥檚 willingness to abandon its nuclear ambitions.

The Washington Post on Tuesday reported that U.S. intelligence officials suspect that North Korea is continuing to build new missiles in the same research facility that manufactured the country鈥檚 ballistic missiles capable of reaching the United States.

The Post also reported that North Korean officials have talked about how they plan to deceive the U.S. about the size of their arsenal of missiles and nuclear warheads and facilities.

Ken Thomas, The Associated Press

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