your president calls, you serve. and now a new title. grandma. >> i believe that when families are strong america is strong. it's your time. tragic news over the "weekend now." a manhunt is under way in tennessee this morning for tremaine wilburn, suspected of fatally shooting a memphis police officer, sean bolton during a traffic stop wednesday night. >> reporter: in but an instant saturday night, routine traffic stop turned deadly for memphis police officer sean bolton. >> heard bang bang bang. bang bang bang. >> reporter: the 33-year-old officer was shot repeatedly. despite a bulletproof vest later pronounced dead at the hospital. the first call for help came on patrolman bolton's own police radio from a bystander. >> please, please hurry up. >> they actually picked up the