In a wide-ranging interview with the BBC's North American Editor Jon Sopel, US President Barack Obama said a lack of changes on US gun laws was the "greatest frustration" of his presidency. Mr Obama also told the BBC what he will say about gay rights in Kenya, why his own Congress and the Gulf nations should accept the recent Iran nuclear deal, and what he expects his legacy as president will be. Subscribe to BBC News HERE bit.ly/1rbfUog Check out our website: www.bbc.com/news Facebook: www.facebook.com/bbcworldnews Twitter: www.twitter.com/bbcworld Instagram: instagram.com/bbcnews