A top US senator on Sunday said the United States should consider direct nuclear talks with Iran. Republican Sen. John McCain added, however, "there has to be some kind of glimmer of hope or optimism before we sit down and give them that kind of legitimacy." McCain, a possible presidential contender in 2008, told CBS' Face the Nation television program that Iran must renounce its call for the extinction of Israel. Direct talks, McCain said, are "a tough decision, because here's a country whose rhetoric daily continues to be the most insulting to the United States and to democracy and freedom." But, he said, "it's an option that you probably have to consider."