President Obama on Monday defended U.S. military action in Libya, saying it supported an international mandate from the U.N. Security Council. Speaking from Chile, a stop on his Latin American tour, the president said Libyan leader Muammar Qadhafi not only carried out murders of civilians, but "threatened more." Obama repeated his administration's view that Qadhafi "needs to go." The president said, "We can't simply stand by with empty words. We have to take some sort of action."