President Barack Obama is casting Mitt Romney as a greedy, job-killing corporate titan with little concern for the working class in a new, multi-pronged effort that seeks to undermine the central rationale for his Republican rival’s candidacy: His business credentials.

REPUBLICAN front-runner Mitt Romney continued to defend his leadership of a private equity firm amid claims he was a job killer while he was chief executive.

A former US government informant was charged over the country’s largest case of credit and debit card data theft.

Eleven people face charges over the hacking of nine major US retailers and the theft and sale of more than 41 million credit and debit card numbers.