[Nick Valencia, Cnn Correspondent:] Jake, this all started on Saturday night, when Bolton, the officer there on your screen, spotted a car parked illegally. He approached the car, and according to police, that's when he was confronted by the passenger. He reportedly broke up a small-scale drug deal, about $20 worth of marijuana found in that car, as well as a digital scale. The suspect opened fire on the police officer, shooting him multiple times. Local residents in the area heard the commotion. They rushed to the scene and used Bolton's radio to try to phone in 911 dispatch to let them know what happened, but it was simply too late. Bolton was rushed to the hospital where he was pronounced dead. He is the third Memphis police officers to die in the line of duty in the last four years Jake.
[Tapper:] Nick, tell me about the suspect's alleged driver. My understanding is that he's turned himself in, but has not been charged with anything?
[Valencia:] Sometime on Sunday afternoon, that driver who was in the car turned himself into police voluntary. We spoke to his attorney a little while ago, and he said that his client's information during that interrogation with police was instrumental in leading to the arrest warrant for 29-year-old Tremaine Wilbourn. That driver, we should mention, still has not been charged. The attorney is maintaining that driver's innocence Jake.
[Tapper:] Nick Valencia, thank you so much. Now to another city where federal agencies are assisting the local police, Baltimore, which is facing an almost unprecedented level of violence. The city has requested federal help for quell the crime wave there. Here's a look at the homicide rate from just this year; 191 people have been killed in 2015, 116 of them in just the past three months, 42 people killed in May. That's the month after Freddie Gray died in police custody. July saw 45 deaths from violence, making July the deadliest month in Baltimore since 1972. And in the first few days of August, there were at least two more deaths in that city. A total of 10 special agents now from the FBI, DEA, ATF, the U.S. Marshals and the U.S. Secret Service will be helping Baltimore's cops, two from each agency. With all the talk about whether Vice President Biden will enter the race for the White House, what does the current occupant of the residence think about the possibility of handing over the keys to his number two? That story next.