Cameron: Trade deal 'once in a generation prize'
17 June 2013 Last updated at 16:01 BST
David Cameron, Barack Obama, and the leaders of the European Commission and Council, have unveiled an agreement to open negotiations on an EU-US trade deal.
The talks will start in July, with the aim of concluding by the end of 2014.
Speaking at the G8 summit in Loch Erne, Mr Cameron said that a deal would be 'once in a generation prize'.