US President Donald Trump said that he told his top diplomat not to waste his time trying to negotiate with North Korean leader Kim Jong Un. <br/><br/>In a tweet, Mr Trump said he has told Secretary of State Rex Tillerson that he is wasting his time trying to negotiate with the North Korean leader. <br/><br/>President Trump's comment came the day after Tillerson disclosed in China that the United States is directly communicating with North Korea on its nuclear and missile programs but that Pyongyang has shown no interest in dialogue. <br/><br/>Mr Trump asked the Secretary of the State to save his energy and US will do what has to be done.<br/><br/>