Washington :Donald Trump holds a high-stakes meeting with South Korea’s president at the White House Tuesday, talks that could decide whether the US president’s much-vaunted summit with the North’s leader Kim Jong Un goes ahead. Moon Jae-in jets into Washington on a mission to salvage a rare diplomatic opening between the US and North Korea that is in trouble almost before it begins. Trump had agreed to meet inscrutable “Supreme Leader” Kim in Singapore on June 12, but the first-ever US-North Korea summit is now in serious doubt, with both sides expressing reservations. South Korea — worried about Kim’s bellicose weapons testing and Trump’s similarly bellicose warnings about a looming war — was instrumental in convincing the two Cold War foes to sit down and talk. Moon sent his own national security advisor to the White House in March, carrying an offer of talks and word that North Korea may be willing to abandon nuclear weapons, an enticing prospect. Trump surprised his guests, his own aides and the world by summarily accepting the meeting, seeing an opportunity to “do a deal” and avoid military confrontation. Pyongyang is on the verge of marrying nuclear and missile technology allowing it to hit the continental United States with a nuke, a capability Washington sees as wholly unacceptable. Since then, there has been a landmark series of intra-Korean meetings, two trips to Pyongyang by Mike Pompeo — first as CIA director then as America’s top diplomat — and three American citizens have been released from the North.