After effectively accusing the Chinese government of foul play on the Korean peninsula, the statement then concludes by saying the bitter trade dispute between the U.S. and China "will be resolved in time" by Trump and "China's great President Xi Jinping".
Trump also used the term after his meeting with Kim when he announced the US was suspending what he called "war games".
Mattis went on to explained Tuesday the USA had suspended the large-scale military drills and but "did not suspend the rest".
Trump announced the halt to wargames after his summit with Kim Jong Un. -South Korea war games.
"They basically don't think we're doing enough", a senior USA official said on Wednesday, referring to the North Koreans.
Andray Abrahamian, a North Korea specialist at Griffith University, told Fairfax Media that Trump was probably seeking to clarify Mattis's widely reported comments that indicated military drills may resume - their suspension was a key concession made by Trump to North Korea at the Singapore Summit.
However, relations with North Korea have recently stalled. "The reason you've not heard much about them is North Korea could not in any way misinterpret those as somehow breaking faith with the negotiation". -South Korea war games.
A Korean organization announced yesterday that researchers discovered that North Korea tried to mine cryptocurrency a year ago.
Jacksonville Shooting Victims Identified
They ran to a nearby restaurant, where workers were waving people inside, and hid in a bathroom until police arrived. He says the suspect died of a self-inflicted gunshot and authorities were still confirming his identity.
The White House Statement also said that the United States trade dispute with China and other differences will be resolved and that Mr Trump's relationship with "China's great President Xi Jinping" remains very strong.
In a series of tweets he also said the U.S. should not be spending on war games with South Korea, but if it did restart them they would be "bigger than ever". "This affects American policy towards North Korea because North Korea is one of the key issues around which USA and Chinese interests pivot".
Mattis said he was working in coordination with Secretary of State Michael Pompeo's diplomatic efforts - "it's all riding on Secretary Pompeo's shoulders", he said - but he also signaled that smaller-scale exercises are going ahead.
The U.S. has conducted military exercises on the Korean peninsula since the mid-1950s and holds a handful of joint operations with South Korea every year, which the Pentagon calls a means of ensuring the two forces are able to work together in the event of an attack.
Trump added that he can restart the wargames any time he wants, and if he does, "they will be far bigger than ever before". "Let's see how the negotiations go".
Sunday's Rodong Sinmun newspaper, the official mouthpiece of the Worker's Party of Korea, claims the United States is plotting with Japan and that the two nations were running drills aimed at invading Pyongyang.
"The question is whether Trump will decide to go bellicose again, or just keep the fiction of the ongoing denuclearization process alive as long as possible", he said.