Battling Terror, Chertoff Felt 'Invisible Burden'

With his tenure nearly over, Homeland Security Secretary Michael Chertoff now openly talks about the pressures that have come with his job keeping America safe from the world's terrorists -- and what he calls the "invisible burden" of being on edge at all times. "I've never taken a vacation where I haven't held my breath waiting for the call to come," he said. "And I've never had a family event where I didn't half expect a tap on the shoulder to go outside and take an emergency phone... Full Story