'The worst moment in the history of the American presidency'

Professor Allan Lichtman, who's predicted the outcome of many US elections, is scathing about Donald Trump's attempt to delegitimise the process. He correctly said Trump's presidential campaign would crumble under the weight of the '13 keys'. SUBSCRIBE to our YouTube channel for more videos:    / skynews   Follow us on Twitter:   / skynews   Like us on Facebook:   / skynews   Follow us on Instagram:   / skynews   For more content go to http://news.sky.com and download our apps: Apple: https://itunes.apple.com/gb/app/sky-n... Android https://play.google.com/store/apps/de... Sky News videos are now available in Spanish here/Los video de Sky News están disponibles en español aquí    / @skynewsespanol