Mitt Romney gratefully completed the long recalibration of his presidential campaign yesterday to focus fire exclusively on Barack Obama after primary voting in Texas on Tuesday pushed him past the magic number of 1,114 delegates he needed to clinch the Republican nomination.

Mitt Romney has clinched the Republican presidential nomination with a win in the Texas primary.

Congress authorises expansion of robotic warfare technology favoured by Obama

Mitt Romney was poised to clinch the Republican presidential nomination after yesterday's Texas primary, a largely uncontested poll that will formalise the former Massachusetts Governor's status as President Barack Obama's challenger in the election in November.

The Long View: Are the Pakistanis being so dastardly when they lock up a national who has helped in a murder?

Nearly nine weeks after Bashar al-Assad's regime formally agreed the UN six-point peace plan, and six weeks after the ceasefire was supposed to come into effect, the killing continues unabated.

“I’m tremendously proud of this album,” Rumer demurely claims about her impending new record, Boys Don’t Cry.

It's been a pretty big few days for world leaders. First the G8 grappled with the economic crisis, then we had the Nato summit on Afghanistan; these are talks of the utmost importance. Maybe, then, it's a little odd that the most memorable image to be produced from the talks was not of sober politicians in statesmanlike negotiation, but of the great and the good getting overexcited by a game of football.

President Barack Obama and Nato leaders expressed confidence in Afghanistan's ability to take the lead for its own security next year, as nations with a stake in the deeply unpopular war met today for talks aimed at paving the way for its end.

Angela Merkel stands alone

One man was arrested on terrorism-related charges and another for possession of explosives, bringing the number of people arrested to five ahead of the NATO summit on Sunday in an alleged plot to target U.S. President Barack re-election headquarters.

Out of America: As students prepare to graduate saddled with record levels of debt, the parallels with the sub-prime mortgage crisis are hard to ignore

US President Barack Obama pledged at a Group of Eight summit today to work with Europe on a package that balances growth with debt reduction as world leaders try to prevent the worsening eurozone crisis from destabilizing the global economy.