A woman leaves flowers at a makeshift memorial for slain San Antonio police Detective Benjamin Marconi on Monday. Marconi was fatally shot during a traffic stop Sunday near police headquarters. Eric Gay/AP hide caption

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Eric Gay/AP

Police investigate a scene after a St. Louis police officer was shot in what the police chief called an "ambush" on Sunday, in St. Louis. Police Chief Sam Dotson said the 46-year-old officer was shot in the face. The suspect got away and a massive search was underway. David Carson/St. Louis Post-Dispatch via AP hide caption

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David Carson/St. Louis Post-Dispatch via AP

Mourners and activists hold a candlelight vigil during a rally in El Cajon, a suburb of San Diego, Calif., on Wednesday, in protest of the police shooting the day before. Bill Wechter/AFP/Getty Images hide caption

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Bill Wechter/AFP/Getty Images

Police in El Cajon, Calif., provided this image, which they say is a still from a bystander's cellphone video of the shooting of an unarmed black man on Tuesday. Police say the man was pointing an object — which was not a weapon — at an officer. El Cajon Police Department hide caption

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El Cajon Police Department

An image from video taken before, during and after the police shooting of Keith Lamont Scott by Charlotte police. The eyewitness video emerged Friday. Rakeyia Scott/NBC hide caption

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Rakeyia Scott/NBC

Protesters, including public defender Toussaint Romain (center), march in the early hours of Friday in Charlotte, N.C. Despite a midnight curfew, police allowed the peaceful march to continue without interference. Protests began on Tuesday night following the fatal shooting of 43-year-old Keith Lamont Scott. Sean Rayford/Getty Images hide caption

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Sean Rayford/Getty Images

Protests in Charlotte, N.C., began Tuesday in response to the fatal police shooting of 43-year-old Keith Lamont Scott at an apartment complex near the University of North Carolina, Charlotte. They continued for a second night. Here, a demonstrator shouts in uptown Charlotte on Wednesday night. Sean Rayford/Getty Images hide caption

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Sean Rayford/Getty Images

Protesters march Wednesday to protest the Tuesday shooting death of Keith Lamont Scott in Charlotte, N.C. Scott, who was black, was shot and killed by police officers, who say Scott was holding a gun and ignored instructions to drop it. Relatives and neighbors say he was holding a book. Brian Blanco/Getty Images hide caption

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Brian Blanco/Getty Images

Police officers face off with protesters on Interstate 85 in Charlotte, N.C., during demonstrations following the death of a man shot by a police officer on Tuesday. Sean Rayford/Getty Images hide caption

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Sean Rayford/Getty Images

Members of the Columbus Police Crime Scene Search Unit investigate the area around the fatal police shooting of Tyre King, 13, Wednesday night. Paul Vernon/AFP/Getty Images hide caption

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Paul Vernon/AFP/Getty Images

Steve Knowlton wipes his eyes as he talks about his mother Mary Knowlton who was fatally shot in Punta Gorda, Fla., by an police officer who mistakenly used live ammunition during a citizens academy "shoot/don't shoot" role-playing exercise. Chris O'Meara/AP hide caption

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Chris O'Meara/AP

A sign reading "Your Life Mattered" hangs on a lectern outside J.J. Hill Montessori School in St. Paul, Minn., on July 14, following a funeral service for Philando Castile at the Cathedral of St. Paul. Castile, who was a cafeteria manager at the school, was shot and killed by police on July 6. Stephen Maturen/Getty Images hide caption

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Stephen Maturen/Getty Images

Democratic presidential candidate Hillary Clinton speaks at the NAACP National Convention in Cincinnati, Ohio on July 18, 2016. JAY LAPRETE/AFP/Getty Images hide caption

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JAY LAPRETE/AFP/Getty Images

Clinton On Police Murders: 'This Madness Has To Stop'

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A photo provided by Trenisha Jackson shows her husband, Montrell Jackson, holding his son, Mason, at a Father's Day event for police officers in Baton Rouge, La. Montrell Jackson and two other law enforcement officers were killed Sunday. AP hide caption

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AP

'Let's Put An End To All This Madness,' Says Brother Of Slain Police Officer

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In this image made from a June 25 police body-camera video released by Fresno Police Department, a police officer points a gun at Dylan Noble in Fresno, Calif. Fresno Police Department/AP hide caption

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Fresno Police Department/AP

U.S. President Barack Obama addresses a press conference during the second day of the NATO Summit at the Polish National Stadium in Warsaw on Saturday. Mandel Ngan/AFP/Getty Images hide caption

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Mandel Ngan/AFP/Getty Images