US vice-president Joe Biden: “Can I do it, can my family? There is no way to put a timetable on that.” Photograph: Getty Images

Vice-president Joe Biden has made his most revealing comments on whether he will mount a third presidential bid, saying the decision rests on whether (...)

Secretary of state John Kerry: Voting against Iran nuclear deal would be a “self-destructive blow to our nation’s leadership”. Photograph: Getty Images

President Barack Obama has scored a major victory by securing the support of Democrat Barbara Mikulski as the 34th senator to back his nuclear deal wi(...)

‘If Obama vetoes a resolution of disapproval, it will take 34 senators to override his veto and block the agreement. That means opponents have to find an unlikely 11 more Democrats. Photograph:  REUTERS

It would not be unusual for members of the US Congress to vote against an international agreement, denouncing it with rhetorical flourishes as appalli(...)

Demonstrators hold signs during a protest in Sao Paulo, Brazil, during a protest in Sao Paulo, Brazil, on Sunday. Nationwide street protests against Brazilian president Dilma Rousseff are keeping pressure on the government. Photograph: Patricia Monteiro/Bloomberg 1:27

Hundreds of thousands of demonstrators returned to the streets in dozens of Brazilian cities on Sunday to call for the impeachment of president Dilma(...)

Jeb Bush has declined to rule out the US resuming the use of torture – with the Republican presidential hopeful saying brutal questioning methods might be justifiable. Photograph: Bloomberg

Jeb Bush has declined to rule out the US resuming the use of torture – with the Republican presidential hopeful saying brutal questioning methods migh(...)

The furious reaction from the American right and vested interest groups to President Barack Obama’s dramatic announcement of his Clean Power Plan last(...)

Democratic Senator Chuck Schumer, who has said he will oppose the nuclear deal between Iran and world powers. Photograph: Andrew Harrer/Bloomberg

US president Barack Obama’s hopes of preserving the nuclear deal between Iran and world powers have been dealt a setback with the announcement by C(...)

Wisconsin Governor Scott Walker  listens as Donald Trump speaks during the Republican presidential debate. Photograph: AFP/Getty Images 0:36

Donald Trump dominated the first Republican presidential debate, where the property mogul was the literal and figurative centre of the action. Trump d(...)

John Kerry: “The fact is that Iran now has extensive experience with nuclear fuel cycle technology. We can’t bomb that knowledge away.” Photograph: Gary Cameron/Reuters

US secretary of state John Kerry on Thursday mounted a furious counterattack against critics of the Iran nuclear deal, telling sceptics it would be fa(...)

Republican presidential contender and businessman Donald Trump. Photograph: Daniel Acker/Bloomberg

Republican presidential contender Donald Trump attacked Arizona senator John McCain’s war record on Saturday, saying the former prisoner in North Viet(...)