Former secret service agent Barry Donadio has spoken to Sky News about the response to the attempted shooting at the White House correspondents' dinner. He said: "It was quite textbook, from the moment you hear the shots fired." Donadio added: "This is what it looks like and at this moment for the secret service, this is a combat zone." Read the latest: http://news.sky.com/story/trump-evacuated-as-gunfire-shots-heard-during-correspondents-dinner-13536647 #donaldtrump #whitehouse #skynews