President Trump has addressed the press conference for nearly an hour taking questions from all sections of the international media.
Asked about the size of the North Korean nuclear arsenal, Trump says it is "very substantial'.
"We have pretty good intelligence ... to know it is pretty substantial," he says. But he insists North Korea could denuclearise very quickly.
Trump says the summit has achieved more than he hoped. He says he only brought up the issue of the remains of prisoners of war at the very end of the meeting. It was "great' that Kim agreed to handing over the remains. He adds, "We're probably going to need another summit."