Barrack Obama during a news conference in Addis Ababa, Ethiopia, today. Photograph: STR/EPA

President Barack Obama has lashed out at Republican presidential candidates for making what he called “ridiculous” claims about his policies and “outr(...)

Ahead of the field: Donald Trump in Texas on Thursday. He said he’s confident of winning the Hispanic vote. Photograph: Matthew Busch/Getty

On Tuesday the Republican senator Lindsey Graham, one of 16 candidates seeking his party’s presidential nomination in the 2016 US elections, appear(...)

Michael Bloomberg , former New York Mayor and founder of media company Bloomberg, is clashing with key staff.

This year, after Michael Bloomberg reasserted control over the company he founded and began to scrutinise its online operations, he suggested in a me(...)

US Supreme Court . . . although conservative-led is now under fire from Republican presidential candidates. Photograph: Karen Bleier/AFP/Getty Images.

There is an entertaining pseudoscientific quality to much American sports coverage. As if the numerical deconstruction of a game and ability to put nu(...)

Former Florida governor Jeb Bush is entering a presidential contest vastly different in size, pace and cost to those which his father and brother took part in. Photograph: Joe Raedle/Getty Images

Nearly 27 years after his father was elected president, moulding a political dynasty that would propel one son into a governor’s office and another in(...)

Hillary Clinton at Texas Southern University, Houston, where she delivered her most aggressive speech since she announced she was running for president.  Photograph: Pat Sullivan/AP Photo

Republican senator Ted Cruz was firing up conservatives gathered to support his colleague Pat Roberts, who was struggling to hold on to his US Senate (...)

Temperature buoy, Nantucket Sound. Once recordings are adjusted  to compensate for  problems in the way   temperatures were measured, a perceived global warming slowdown largely disappears. Photograph: National Oceanic and Atmospheric Administration via The New York Times

Global warming has not undergone a “pause” or “hiatus”, according to US government research that undermines one of the key arguments used by scepti(...)

The US government’s bulk collection program was first revealed by documents obtained by the former NSA contractor Edward Snowden

The US Senate on Tuesday passed a bill that would end the bulk collection of millions of Americans’ phone records, the most significant surveillance r(...)

Lindsey Graham, a three-term senator from South Carolina, cited the increasing violence in the Middle East as motivation for his decision to run. Photograph: Win McNamee/Getty Images

Senator Lindsey Graham, a foreign policy hawk, has become the latest Republican to join the party’s fast-growing field of presidential candidates. Mr (...)

Former Arkansas governor Mike Huckabee, holding his grandson Chandler, as he formally launches his bid for the 2016 Republican presidential nomination during an event in Hope, Arkansas, on Tuesday. With Mr Huckabee is his wife Janet, holding granddaughter Scarlett. Photograph:  Mike Stone/Reuters

Republican Mike Huckabee entered the race for his party’s 2016 presidential nomination on Tuesday, looking to break out from an ever-widening field by(...)