Chants at corner of 5th and Pike St during the Black Lives Matter protest, in Seattle, WA, Friday, Nov. 27, 2015. (Alan Berner / The Seattle Times)

FILE – In this Friday, July 8, 2016 file photo, a woman holds a sign as she and hundreds of other protesters march against the recent fatal shootings by police of black men in San Francisco. Over the course of the Black Lives Matter movement, black activists have had mixed feelings about the response from whites _ commending those who have supported the effort yet decrying what they perceive as disinterest or hostility from a majority of whites. (AP Photo/Noah Berger)

TOPSHOT – Demonstrators from the Black Lives Matter movement march through central London on July 10, 2016, during a demonstration against the killing of black men by police in the US. Police arrested scores of people in demonstrations overnight Saturday to Sunday in several US cities, as racial tensions simmer over the killing of black men by police. / AFP / DANIEL LEAL-OLIVAS (Photo credit should read DANIEL LEAL-OLIVAS/AFP/Getty Images)

Protesters take part in a Black Lives Matter rally at the federal courthouse, Saturday, April 15, 2017, in downtown Seattle. Several thousand people attended a downtown rally and then marched to the courthouse to call attention to minority rights and police brutality. (AP Photo/Ted S. Warren)

WASHINGTON, DC – MARCH 24: Eleven-year-old Naomi Wadler addresses the March for Our Lives rally on March 24, 2018 in Washington, DC. Hundreds of thousands of demonstrators, including students, teachers and parents gathered in Washington for the anti-gun violence rally organized by survivors of the Marjory Stoneman Douglas High School shooting on February 14 that left 17 dead. More than 800 related events are taking place around the world to call for legislative action to address school safety and gun violence. (Photo by Chip Somodevilla/Getty Images)

FILE – In this Friday, July 8, 2016 file photo, a woman holds a sign as she and hundreds of other protesters march against the recent fatal shootings by police of black men in San Francisco. Over the course of the Black Lives Matter movement, black activists have had mixed feelings about the response from whites _ commending those who have supported the effort yet decrying what they perceive as disinterest or hostility from a majority of whites. (AP Photo/Noah Berger)

WASHINGTON, DC – MARCH 24: Eleven-year-old Naomi Wadler addresses the March for Our Lives rally on March 24, 2018 in Washington, DC. Hundreds of thousands of demonstrators, including students, teachers and parents gathered in Washington for the anti-gun violence rally organized by survivors of the Marjory Stoneman Douglas High School shooting on February 14 that left 17 dead. More than 800 related events are taking place around the world to call for legislative action to address school safety and gun violence. (Photo by Chip Somodevilla/Getty Images)

TOPSHOT – Demonstrators from the Black Lives Matter movement march through central London on July 10, 2016, during a demonstration against the killing of black men by police in the US. Police arrested scores of people in demonstrations overnight Saturday to Sunday in several US cities, as racial tensions simmer over the killing of black men by police. / AFP / DANIEL LEAL-OLIVAS (Photo credit should read DANIEL LEAL-OLIVAS/AFP/Getty Images)

Chants at corner of 5th and Pike St during the Black Lives Matter protest, in Seattle, WA, Friday, Nov. 27, 2015. (Alan Berner / The Seattle Times)

Protesters take part in a Black Lives Matter rally at the federal courthouse, Saturday, April 15, 2017, in downtown Seattle. Several thousand people attended a downtown rally and then marched to the courthouse to call attention to minority rights and police brutality. (AP Photo/Ted S. Warren)