In this undated photo provided by Trenisha Jackson, her husband, Baton Rouge Police Officer Montrell Jackson poses for a photo. Montrell Jackson and two other Baton Rouge law enforcement officers investigating a report of a man with an assault rifle were killed Sunday, July 17, 2016, less than two weeks after a black man was fatally shot by police here in a confrontation that sparked nightly protests that reverberated nationwide. (Courtesy of Trenisha Jackson via AP) 

Protestors yell during a rally against Republican presidential candidate Donald Trump on Monday, July 18, 2016, in Cleveland. (AP Photo/Patrick Semansky) 

Police officers talk with community activist Cynthia Davis in the Staten Island borough of New York, Tuesday, May 24, 2016. The recent highly publicized deaths of black men in encounters with police in Minnesota, Louisiana and across the country, and now the sniper killing of five Dallas officers, have focused new attention on the chasm between police and minorities, one of so many divides in this contentious election year. Years of tension have left people wary in both the policing community and in minority neighborhoods, with many yearning for one another’s respect. (AP Photo/Seth Wenig) 

Baton Rouge Police and Louisiana State Police arrest a man as they work to clear Airline Highway after protestors blocked traffic at Goodwood Boulevard, at the Baton Rouge Police headquarters, Friday, July 8, 2016, in Baton Rouge, La. (Hilary Scheinuk/The Advocate via AP 

In this Saturday, July 9, 2016 photo, Gillian Breidenbach looks out her window toward the area where Dallas police set up a command center to respond to the sniper attack that left five officers dead on Thursday night, in Dallas. The chaos and panic that ensued when Micah Johnson sprayed bullets at a protest against police brutality, killing five officers, resonated across a city increasingly defined by its diversity. Now Dallas has become a focal point in the nation’s ongoing debate and struggles around race and criminal justice. (AP Photo/Gerald Herbert)