President Donald Trump is delaying a diplomatic trip to China that was planned for months but began to unravel as he pressured Beijing and other world powers to form a military coalition to protect the vital Strait of Hormuz. Trump said Tuesday while meeting with Irish Prime Minister Micheál Martin in the Oval Office that he would be going to China in five or six weeks’ time instead of at the end of the month. Trump’s visit to China is seen as an opportunity to build on a fragile trade truce between the two superpowers, but it became tangled in his effort to find an endgame to his war in Iran.