BLACKWELL: Checking in on our other breaking news this morning, the manhunt for a cop killer in Memphis.</s>PAUL: That manhunt going on right now. Nick Valencia has been talking to folks there. What have you learned this morning, Nick?</s>NICK VALENCIA, CNN CORRESPONDENT: Good morning, Victor and Christi. We just got off the phone with the Memphis police department. No new details in their investigation. But as you mentioned, an active search underway right now for whoever was responsible for fatally shooting a Memphis police officer overnight. 33-year old Shawn Bolton was the veteran police officer there in Memphis. He was shot and killed, shot multiple times during a traffic stop. A police had a press conference yesterday saying that a citizen used the officer's radio to radio back into police to let them know that one of their own had been shot. He was rushed to the hospital where he later died. The mayor of Memphis addressing the public last night.</s>MAYOR A.C. WHARTON JR., MEMPHIS, TENNESSEE: This, again, evidences the fact that there are so many guns on our streets in the wrong hands. That's the key thing. And the men and women in blue have certain rules of engagement that they have to follow. But in any given minute in a 24-hour day, they're dealing with folks who have no rules of engagement.</s>BLACKWELL: The Memphis police director saying that this is the third police officer shot in the four years that he's been head of the Memphis police department. No description has been given of the suspect. Christi.</s>PAUL: All right, Nick Valencia, I appreciate the update. Thank you so much. We'll be checking in with him throughout the morning as well.</s>BLACKWELL: New this morning, reports that Vice President Joe Biden is exploring possibly a presidential campaign. So what happened that may have changed the vice president's mind?
Police Officer Shot in Tennessee.