Britain's Prime Minister Gordon Brown laughs at the Foreign Press Association in London, Friday March 19, 2010, where he made a speech on Britain's role in the world economically and on international security. Brown said he's likely to interrupt campaigning in Britain's looming election to attend President Barack Obama's summit on nuclear weapons, saying that a summit in Washington on April 12-13 would aim to both reduce the threat of rogue nations - or terrorists - gaining access to nuclear weapons, and discuss disarmament.(AP Photo/Stefan Rousseau, pool)