US border patrol agents detaining undocumented immigrants  after they crossed the border from Mexico into Texas. Photograph: John Moore/Getty Images

“Anyone truly interested in US-Mexican border issues needs to stay for more than an afternoon,” says Judith Zafferini, a Democratic state senator for (...)

US  presidential candidate Donald Trump at Manhattan Supreme Court in New York on Monday, where he appeared for jurty duty. Trump’s  hard line on immigration has driven rivals to match his biting anti-immigrant language. Photograph: Lucas Jackson/Reuters

Republicans thought they had learned a lesson after 2012: Turning off Latino voters ensures defeat in the general election. But as the disruptive US p(...)

Republican presidential candidate and former Florida Governor Jeb Bush says the retirement age should be pushed back to “68 or 70”. Photograph: Gretchen Ertl/Reuters

Something strange is happening in the Republican primary – something strange, that is, besides the Trump phenomenon. For some reason just about all th(...)

Carly Fiorina, former chairman and chief executive officer of Hewlett-Packard, who is the only woman seeking the Republican presidential nomination.  Photograp: Andrew Harrer/Bloomberg

This week, Donald Trump said listening to Carly Fiorina, the only woman competing for the Republican presidential nomination, gave him “a massive head(...)

Donald Trump speaking to the media after the first Republican presidential debate. A feud with Fox News moderator Megyn Kelly has failed to dent his popularity, according to a Reuters/Ipsos poll. Photograph: Andrew Harrer/Bloomberg

Donald Trump continued to defy the laws of political gravity on Monday as a Reuters/Ipsos poll found the real estate mogul holding on to a wide lead (...)

Donald Trump and Jeb Bush participate in a debate of ten leading Republican presidential hopefuls at the Quicken Loans Arena in Cleveland. Photograph: Doug Mills/The New York Times

The first question to Chris Christie was about the nine credit downgrades that New Jersey had suffered since he became its governor. Ben Carson was(...)

Ahead of the first US Republican TV debate on Fox, Donald Trump sits atop the polling average - and has in fact widened his lead - with Jeb Bush and Scott Walker behind him. Photograph:  Frederic  J. Brown/AFP/Getty Images.

For the last several weeks, the likely slate of US Republican candidates for the first televised debate this week has shifted constantly at the cut(...)

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(...)