Details about the shooting at the White House correspondents' gala have started to surface as the alleged shooter is set to be charged. The suspect was able to get close to where Donald Trump and many other senior officials were gathered, before law enforcement officers stopped him. It happened less than two years after the US president was the target of an assassination attempt in Butler, Pennsylvania, and a subsequent attempt at a golf course in Florida. Lucy Hough speaks to the Guardian's Washington bureau chief David Smith, who was in attendance