Sensing a moment of political vulnerability on national security, Republicans pounced Friday on disclosures that President Barack Obama's administration could have known early on that militants, not angry protesters, launched the attack on U.S. diplomats in Libya.

Paul Ryan, the Republican vice presidential nominee, led Friday's charge. "Look around the world, turn on your TV," Ryan said in an interview with WTAQ radio in the election battleground state of Wisconsin. "And what we see in front of us is the absolute unraveling of the Obama administration's foreign policy."

The issue has given Republican presidential nominee Mitt Romney an opportunity to question Obama on foreign policy and national security, two areas that have received little attention in an election dominated by the U.S. economy. Obama's signature national security accomplishment is the military's killing of terrorist leader Osama bin Laden. Ryan was teeing up the issue for Monday's presidential debate on foreign policy. "I'm excited we're going to have a chance to talk about that on Monday," Ryan said.