Trump deepens attack on former Miss Universe, Clinton calls him 'unhinged'

By Doina Chiacu WASHINGTON (Reuters) - Republican presidential candidate Donald Trump deepened his attacks on a former beauty queen Alicia Machado on Friday, calling her "disgusting" and alleging the existence of a sex tape as he refused to back away from an issue that threatens to damage his already weak standing among women and Hispanics. Trump was quickly and sharply rebuked by his Democratic rival, Hillary Clinton, and by Machado, a Venezuelan-born former Miss Universe who was criticized by