In July, he revealed the full contents of another letter from Kim on Twitter.
Still, the initial field forensic review indicated the "remains are what North Korea said they were", Byrd said. "I am not at all surprised that you took this kind action", Trump wrote in a Twitter message.
"I know that President Trump is grateful that Chairman Kim has kept his word, and we see today this tangible progress in our efforts to achieve peace on the Korean peninsula", said Pence, whose father fought in the Korean War.
Some have called the Korean War the "forgotten war".
The ambassador added a good starting point would be a North Korea list of nuclear facilities.
With little public sign of progress toward Trump's aim of Korean denuclearization, the White House said the letter followed up on the pair's June 12 summit.
McKeague said that DPAA has a DNA database from 92 percent of the families of the estimated 7,700 US service members still listed as missing from the 1950-53 Korean War and DNA comparisons with the remains from the 55 cases would begin shortly.
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Following his talks with Ri, China's top diplomat, State Councillor Wang Yi, said he hoped North Korea and the United States continue to move forward to implement their leaders' agreement.
More than 35,000 Americans died on the Korean Peninsula and 7,702 are still unaccounted for, according to the Defense POW/MIA Accounting Agency. It marks the beginning of a long process to identify all the remains.
China is North Korea's most important economic and diplomatic supporter and fought for the North in the 1950-53 Korean War against the US -led United Nations forces that backed South Korea.
The United States and North Korea conducted joint searches from 1996 until 2005, when Washington halted the operations, citing concerns about the safety of its personnel as Pyongyang stepped up its nuclear programme. But today, we prove these heroes were never forgotten.
Military pallbearers carry the remains of USA service members collected in the Democratic People's Republic of Korea during Repatriation ceremony after arriving to Joint Base Pearl Harbor-Hickam, Honolulu, Hawaii, Aug. 1 2018.
As he secured a commitment for the complete denuclearization of the Korean Peninsula, @POTUS also secured a promise from Chairman Kim to return the remains of all fallen USA service-members lost in North Korea.
A USA defense official told VOA North Korea has provided nearly no information to help identify the individuals, and that the process could take months or years to complete.
The remains handed over by North Korea last week in 55 boxes are "consistent with being Americans", based on an initial examination, although none has been positively identified, a US scientist who has seen the remains said today.