 Siavash Adelan of BBC Persian, thank you for joining us here on The Newsroom. Well, next, Joe Biden is showing no signs of caving into pressure to pull out of the US presidential race. In his first television interview since his disastrous performance in the TV debate with Donald Trump just over a week ago, some Democrats are concerned that at 81, the president is too old to persuade enough voters to re-elect him in November. Mr Biden was speaking to George Stephanopoulos from ABC News.