On climate change Obama says, "I've heard some folks try to dodge the evidence by saying they're not scientists. Well, I'm not a scientist, either. But you know what -- I know a lot of really good scientists at Nasa, and NOAA, and at our major universities."

Referring to the coalition fighting Islamic State, the US president says: "Tonight, I call on this Congress to show the world that we are united in this mission by passing a resolution to authorise the use of force against ISIL."