. >> apple ceo, ktim cook, is really digging his heels in this one. >> reporter: he is. good morning, apple ceo, tim cook, refusing to unlock the cell phone of one of the san bernardino shooters citing precedent. today, he issued a letter saying why his company will fight a magistrate's order to unlock the cell phone of farook. verbts are trying to access data for a month and a half before to the attack and can't because farook may have disabled th the icloud feature. he wants them to back door the ios operating system that would bypass the security currently found on alliphones. cook says it would be the equivalent of a master key that would unlock millions of other phones and points out there's no guarantee the government could or would keep the so-called master key confined to the terrorist iphone. this is tim cook. we are challenging the fbi's demands with the deepest respect for american democracy and love of our country. we believe it would be in the best interest of everyone to step back and consider the implications of everyone unquote. cook went on to write it h