Donald Trump has vowed to attend the Republican Convention on Monday in Milwaukee, one day after he was nearly assassinated by a 20-year-old in Pennsylvania - while new details begin to emerge about the abhorrent security failures that took place.

According to sources, a police officer backed away when the would-be assassin pointed a rifle at him, just moments before he then fired in Trump's direction, clipping his ear.  

Trump announced he will not be delaying his Wisconsin trip - less than 24 hours after he was shot by Thomas Matthew Crooks from a rooftop 130 yards away.