Latest: US police have arrested a man suspected of killing two police officers in Iowa.

The Republicans' newly-chosen vice presidential candidate wasted no time in attacking Barack Obama's economic stewardship in his first solo campaign event.

Mitt Romney faces a daunting to-do list as he transitions into the role of likely Republican presidential nominee.

NEWT GINGRICH has charged into the fray over illegal immigration, risking conservative fury just as his Republican presidential campaign — once declared all but dead — has vaulted into front-runner status.