Britain will not help the USA attack North Korea if a war breaks out, it has been revealed.
Asked what would be tougher than "fire and fury", Trump said, "You'll see".
"I have never felt so safe or so confident than with you at the helm", Calvo said, adding that "we need a president like you".
Xi also reiterated to Trump, according to media reports in China, that the us and China are aligned in wanting the denuclearization of North Korea, and peace.
He says days of grave threats to the communist country's leader would be welcomed as "a great statement" if "somebody else" uttered them.
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He is very driven, he is tactically aware and you can see his personality on the sidelines. But for sure we want to try to fight, to fight until the end, to try to retain the title.
"We're very much in agreement", Mr. Trump said.
Russia's foreign minister, Sergei Lavrov, said: "Unfortunately, the rhetoric in Washington and Pyongyang is now starting to go over the top".
The White House confirmed early Saturday that Trump and Xi spoke Friday.
Mr Trump has been engaged all week in verbal sparring with the North over its weapons and missile programmes, as U.S. media reported Pyongyang has successfully miniaturised a nuclear warhead.
Despite the rhetoric, USA officials said there was no major movement of US military assets to the region, nor were there signs Pyongyang was actively preparing for war. "When you say bad solution, are you talking about war?"
Media captionWho's in Trump's good and bad books?
The Asian country was also angered by a United Nations decision to increase economic sanctions against it last week.
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There has been no indication that any actual attack on the Pacific island is imminent.
North Korea's military responded to that threat, saying that it is developing plans for a possible strike on Guam. Pyongyang has repeatedly threatened to turn the South Korean capital, Seoul, into a "sea of fire" and has thousands of artillery units in place along the border to do it.
"We're going to do a great job, don't worry about a thing", Trump then added.
As North Korea's only real ally, China has more influence than any other nation over the hermit nation.
It comes after United States intelligence analysts concluded that North Korean scientists had developed a nuclear warhead small enough to fit on a ballistic missile.
But it also said that if the US and South Korea attacked North Korea to force regime change, then China must intervene to prevent it.
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