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BOCA RATON, Fla. -- President Barack Obama and Republican challenger Mitt Romney squared off in south Florida for their third and final debate Monday night. Obama came out swinging and Romney fought back as the two discussed foreign policy at Lynn University.

Romney criticized the president's policies toward Islamic extremism. He says that Obama missed an opportunity during the Arab Spring and says that Obama has not done enough to block Iran from building a nuclear weapon.

While Obama said Romney has not been in a position to execute foreign policy but added that his positions to this point have "been all over the map.'' Romney says his strategy "is pretty straight forward: go after the bad guys.''

The candidates also debated the challenge of a changing Middle East and the new face of terrorism, as well as America's role in the world.

Bob Schieffer of CBS News moderated the debate.