In a UK exclusive, Barack Obama encounters historian David Olusoga to discuss his long-awaited memoir A Promised Land, and how he may have cast a spotlight on the racial fault lines in America. Show more
First broadcast: on BBC One Northern IrelandLatest broadcast: on BBC One Wales
On his 89th birthday, David Attenborough talks to President Obama about his career, his recent record-breaking dive on the Great Barrier Reef and issues facing the natural world. Show more