(CNN) – President Barack Obama responded to a controversial ad from an outside group backing his presidential campaign while pushing back on Republican claims that his administration would drop the work requirement from welfare-to-work programs, in an unannounced appearance in the White House Briefing Room Monday.

Asked about the ad created by a pro-Obama super PAC, Priorities USA Action, which linked presumptive Republican nominee Mitt Romney to the death of a steelworker's wife during his tenure at Bain Capital, Obama said that he does not think that Romney is responsible for the woman's death.

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