Trump's comments to reporters on the White House lawn before leaving to visit Alabama came after two US think tanks and Seoul's spy agency said this week that North Korea was rebuilding a rocket launch site.
There have also been reports emanating from South Korea's intelligence service of new activity at a factory that produced North Korea's first intercontinental ballistic missiles capable of reaching the United States.
Trump said he thought his and the US relationship with Kim and North Korea was "a very good one."
"I think it remains good," he said.
Trump, eager for a big foreign policy win on North Korea which has eluded his predecessors for decades, has repeatedly stressed his good relationship with Kim. He went as far late last year as saying that they "fell in love," but the bonhomie has failed to bridge the wide gap between the two sides.
A second summit between Trump and Kim collapsed last week over differences on US demands for Kim to give up his nuclear weapons and North Korea's demands for sanctions relief.
North Korean state media acknowledged the fruitless summit for the first time on Friday, saying people were blaming the United States for the lack of an agreement.
"The public at home and abroad that had hoped for success and good results from the second ... summit in Hanoi are feeling regretful, blaming the US for the summit that ended without an agreement," its Rodong Sinmun newspaper said in a commentary.
The paper directed fiery rhetoric against Japan, accusing it of being "desperate to interrupt" relations between Pyongyang and Washington and "applauding" the breakdown of the summit.
Washington has said it is open to more talks with North Korea but it has rejected an incremental approach to negotiations sought by Pyongyang and it remains unclear when the two sides might meet again.
US Secretary of State Mike Pompeo said on Monday he was hopeful he would send a delegation to North Korea for more talks in the next couple of weeks, but that he had received "no commitment yet."
A senior State Department official who briefed reporters in Washington on Thursday said the United States was keen to resume talks as soon as possible, but North Korea's negotiators needed to be given more latitude than they were given ahead of the summit.
"There will necessarily need to be a period of reflection here. Both sides are going to have to digest the outcome to the summit," said the official, who spoke on condition of anonymity.
"Fundamentally, where we really need to see the progress, and we need to see it soon, is on meaningful and verifiable steps on denuclearization. That's our goal and that's how we see these negotiations picking up momentum."
The official said complete denuclearization was the condition for North Korea's integration into the global economy, a transformed relationship with the United States and a permanent peace regime on the Korean peninsula.
White House National Security Adviser John Bolton, a hard-liner who has argued for a tough approach to North Korea, said this week that Trump was open to more talks, but also warned of tougher sanctions if North Korea did not denuclearize.
Bolton and other US officials have sought to play down the activity spotted at the Sohae rocket launch site, although Trump on Thursday called it "disappointing.”
The official who briefed reporters on Thursday said he would "not necessarily share the conclusion" of the think tanks that the Sohae site was operational again, but said any use of the site would be seen as "backsliding" on commitments to Trump.
North Korea has frozen nuclear and missile testing since 2017, and Trump has pointed to this as a positive outcome from nearly a year's engagement with North Korea.
Sohae has been used in the past to rest missile engines and to launch rockets that US officials say have helped development of North Korea's weapons programs. (Reporting by Roberta Rampton, David Brunnstrom, Lisa Lambert and Susan Heavey in Washington and Hyonhee Shin, Joyce Lee and Ju-min Park in Seoul Editing by Jonathan Oatis)
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