David Cameron

Britain's Prime Minister David Cameron welcomes Germany's Chancellor Angela Merkel to the Lough Erne golf resort where the G8 summit is taking place in Enniskillen...Britain's Prime Minister David Cameron welcomes Germany's Chancellor Angela Merkel to the Lough Erne golf resort where the G8 summit is taking place in Enniskillen, Northern Ireland June 17, 2013.

Yves Herman/Reuters

UK Prime Minister David Cameron welcomes German Chancellor Angela Merkel to the Lough Erne golf resort where the G8 summit is taking place in Enniskillen, Northern Ireland.

Cameron visit to London Gateway container port

Stefan Rousseau/PA Wire

Prime Minister David Cameron looks over the River Thames estuary from the top of a 138m-high quay crane at the new London Gateway container port which is under construction on the River Thames near Tilbury in Essex on Monday

Barack Obama, David Cameron...President Barack Obama and British Prime Minister David Cameron walk off the stage after their joint news conference,  Monday, May 13, 2013, in the East Room of the White House in Washington, where they talked about various topics including Syria's civil war. (AP Photo/Jacquelyn Martin)

Jacquelyn Martin/AP

US President Barack Obama and British Prime Minister David Cameron walk off the stage after their joint news conference on Monday in the East Room of the White House in Washington, where they talked about various topics including Syria’s civil war. Read more

Cameron on the local election campaign trail

Tim Ireland /PA

Prime Minister David Cameron speaks to workers at the Morrisons Distribution Centre in Bridgewater, Somerset, UK, as he goes on the local election campaign trail.