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(...)

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(...)

 President Barack Obama: stressed that there was no alternative to the deal. Photograph: Getty Images

The tough negotiations leading to a nuclear deal with Iran may have concluded in Vienna, but the hard work on selling the agreement to sceptical Repub(...)

Rory Staunton died in April 2012 after scraping his arm during a basketball game. Photograph: Handout via The New York Times

An American senator used the first US national forum on sepsis organised by an Irish emigrant couple to unveil plans to make September National Sepsis(...)

Rory Staunton: who died in 2012 from septic shock after he received a scratch on his arm during a basketball game. Photograph: The “New York Times”

The first US national forum on sepsis, the life-threatening condition caused by an infection of the blood stream, takes place in Washington today, hos(...)

EU foreign policy chief Catherine Ashton and Iran’s foreign minister Mohammad Javad Zarif at the start of talks in Vienna yesterday. Iran and six world powers began a new round of negotiations aimed at settling the dispute over Tehran’s nuclear programme by late July. Photograph: Heinz-Peter Bader/Reuters

Iran defended its nomination as ambassador to the United Nations yesterday after hawks in the US senate passed legislation to ban the official (...)

New American citizens pose for photographs after  a recent naturalisation ceremony in New York City. House Republicans met last week to discuss moves to give status to illegal migrants. Photograph: John Moore/Getty Images

Democrats and Republicans are entrenched on most political issues in a deeply divided US Congress but one issue that is drawing them out of their foxh(...)

A cleaner dusts a statue of Alexander Hamilton, a founding father of the US, in the Rotunda on Capitol Hill in Washington yesterday as the US government shutdown entered a third week. Photograph: Joshua Roberts/Reuters

A possible congressional deal to avert a default after the United States reaches a debt limit tomorrow fell apart yesterday as Senate Democrats and th(...)

US president Barack Obama in the briefing room of the White House in Washington last night.  He  said  a government shutdown was entirely preventable and accused Republicans in the House of Representatives of manufacturing a crisis that would hurt the economy and citizens across the country. Photograph: Larry Downing/Reuters

US president Barack Obama urged House Republicans to pass a short-term budget and keep the government open as political opponents were locked in a sta(...)