WASHINGTON - US President Donald Trump said on Thursday that Pyongyang is a problem that 'will be taken care of,' as speculation rose that North Korea might be on the verge of a sixth nuclear test. Trump, responding to a question about what his message is for North Korea, said, 'North Korea is a problem. The problem will be taken care of.' He said he believed Chinese President Xi Jinping would 'work very hard' to help resolve the challenge. The president said he had spent a lot of time with Xi last week in Florida. 'I have really gotten to like and respect President Xi. ... He's a very special man. I think he's going to try very hard.'