An estimated 50,000 people, including 15,000 media are at the Republican National Convention in Cleveland Ohio - a media presence second only to the Rio Olympics.
There was uproar at the start of the convention when some opponents of presumptive U.S. presidential nominee Donald Trump stormed out of the room and chanted in protest at their failure to win a symbolic vote opposing his candidacy.
Simon Marks talked to Jesse Mulligan live from the event.