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After Politico reported that Mr. Biden is mulling a new gun push on his own, White House press secretary Jay Carney said Friday that the vice president is a “key player” and “continues to play a leading role in that effort at the president’s direction.”

“Sometimes these efforts don’t succeed initially, but especially when you have 85 or 90 percent of the American people supporting — in the case of background checks being expanded — a legislative proposal, this is going to get done,” Mr. Carney said, adding that Mr. Obama “is committed to pressing for action to reduce gun violence and that includes pressing Congress to take action.”

This story is based in part on wire service reports.