War of words ratchets up between Kim and Trump

An escalating war of words between Donald Trump and Kim Jong-Un ratcheted up a notch on Friday as the US president dubbed North Korea's leader a "madman," a day after the reclusive regime hinted it may explode a hydrogen bomb over the Pacific Ocean.Hours earlier, in a rare personal attack, Kim took aim at Trump, branding him "mentally deranged" and a "dotard", and warning he would "pay dearly" for his threat to destroy North Korea if challenged, uttered before the United Nations General Assembly