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 (...)

Former Texas governor Rick Perry at the announcement in Dallas yesterday of his candidacy for US president in 2016. Photograph:  Ron Jenkins/Getty Images

With 521 days to go until the US presidential election, the field is already packed with candidates. Far more Republicans have declared; among (...)

The fight over the sweeping domestic spying powers, revealed in media leaks by former NSA contractor Edward Snowden, has moved to the Senate where majority leader Mitch McConnell and other Republicans want the Patriot Act bulk collection extended until 2020. Photograph: Zach Gibson/The New York Times

The US Senate is facing intense pressure to enact a law maintaining the power to track telephone calls as part of counterterrorism efforts before the(...)

David Wildstein, former executive of the  Port Authority of New York and New Jersey, is to plead guilty to charges stemming from the ‘Bridgegate’ scandal. Mr Wildstein is a close ally of New Jersey governor  Chris Christie, who is expected to run for the Republican presidential nomination. Photograph: Mike Segar/Reuters

A close ally of Chris Christie, the New Jersey governor whom many expect to run for the Republican presidential nomination, has told a federal judge t(...)

US Republican senator Ted Cruz: he pushed his party to force a government shutdown in 2013 in an unsuccessful bid to deny funding to the Affordable Care Act, drawing the disapproval of Republican leaders and praise from the grassroots Tea Party. Photograph: Nicholas Kamm/AFP/Getty Images

Texas senator Ted Cruz, who has frequently clashed with leaders of his Republican Party, will announce on Monday that he plans to run for president, (...)

Nigel Farage, leader of the United Kingdom Independence Party, addresses the 42nd annual Conservative Political Action Conference. Photograph: Alex Wong/Getty Images

Nigel Farage, leader of the UK Independence Party, was warmly received at a major US conference of conservatives with a message denouncing EU immigra(...)

Scott Walker, governor of Wisconsin: he surged ahead last weekend in an opinion poll in Iowa, a year before parties there nominate their candidates. Photograph: Andrew Harrer/Bloomberg

When Republican governor Scott Walker proposed cutting another $300 million (€214 million) off the University of Wisconsin’s budget and told its teach(...)

Chris Christie, governor of New Jersey, at a match between Arsenal and Aston Villa at the Emirates Stadium in London, on Sunday. Photograph: Eddie Keogh/Reuters

New Jersey governor Chris Christie on Sunday began a three-day trade mission to the UK. The trip is meant to bolster his state’s economic and cultura(...)

 Mitt Romney and former Florida governor Jeb Bush (L) pose for a photograph together. Mr Romney has said he will not contest the 2016 presidential campaign. Photograph: Brian Snyder/Reuters/Files.

US Republican Mitt Romney, the two-time presidential candidate, has passed on a third attempt after briefly flirting with another bid, bolstering the (...)

Women take a selfie as they stand in an uncharacteristically empty Times Square, New York City January 27th, 2015. Photograph: REUTERS/Adrees Latif 1:38

New York City, which was shut down overnight, was spared the worst of a snowstorm that swept across the Northeast early Tuesday and slowly returned to(...)