The White House has questioned the mental health of North Korean leader Kim Jong-un after his repeated threats to the US that he has nuclear button on his desk. White House Press Secretary Sarah Sanders told reporters at her daily news conference that she think the President and the people of this country should be concerned about the mental fitness of the leader of North Korea. He has made repeated threats. He has tested missiles time and time again for years.<br/>'<br/>Sanders was responding to questions on Trump's nuclear button tweet, after which some political analysts in the US have been questioning his mental fitness.This is a President who's not going to cower down and he's not going to be weak, and is going to make sure that he does what he's promised to do, and that's stand up and protect the American people," Sanders said.<br/>'<br/>A day earlier, Trump, responding to the latest rhetoric of North Korean leader Kim Jong un, said that he too has a nuclear button which is not only much bigger and powerful, but also works.North Korean Leader Kim Jong Un had said that the Nuclear Button is on his desk at all times.<br/>'<br/>Trump is concerned about the continued threats that this individual has made towards the US and others, Sanders said. Trump is not going to allow him to continue doing that without saying something and standing up for the people of the country, the White House spokesperson said.The white House defended Trump's tweet.