Protesters with the Black Lives Matter movement argue with police to let them walk down the sidewalk during a rally outside Graceland on Elvis Presley Blvd, July 12, 2016, in Memphis, Tenn. Dozens of protesters associated with the Black Lives Matter movement demonstrated Tuesday outside the gates of Graceland, the former home of Elvis Presley. Police said four people were detained for blocking the street.

Tamam Quran is handcuffed and detained by police during a Black Lives Matter rally outside Graceland on Elvis Presley Blvd, July 12, 2016, in Memphis, Tenn. Dozens of protesters associated with the Black Lives Matter movement demonstrated Tuesday outside the gates of Graceland, the former home of Elvis Presley. Police said four people were detained for blocking the street.

In this July 14, 2016 photo, protesters gather on the steps of the state Capitol in Lincoln, Neb., to protest the recent police shootings of black men in Minnesota and Louisiana.

Friends and family pay their respects as they attend the funeral of Alton Sterling at Southern University, July 15, 2016, in Baton Rouge, Louisiana.

Friends and family attend the funeral of Alton Sterling, in Baton Rouge, Louisiana, July 15, 2016.

Sandra Sterling, aunt of Alton Sterling, cries during the funeral of her nephew, July 15, 2016, in Baton Rouge, Louisiana.

An inmate with the Louisiana Department of Corrections is consoled by friends and family as they attend the funeral of Alton Sterling, who was shot dead by police, in Baton Rouge, Louisiana, July 15, 2016.

Mourners visit the body of Alton Sterling at the F.G. Clark Activity Center in Baton Rouge, Louisiana, July 15, 2016. Sterling was shot July 5, 2016, outside a Baton Rouge convenience store in an encounter with police that was caught on video.

Diamond Reynolds' daughter looks on as the funeral procession for Philando Castile travels from the Brooks funeral home to the St Paul Cathedral in St Paul, Minnesota, July 14, 2016.

Friends and family follow the funeral procession for Philando Castile as it makes its way along Concordia Avenue to The Cathedral of Saint Paul, July 14, 2016, in St. Paul, Minnesota.

Attendees grieve outside The Cathedral of Saint Paul before Philando Castile's funeral service, July 14, 2016, in St. Paul, Minnesota.

The long line outside the St. Paul Cathedral for the funeral of Philando Castile, July 14, 2016, at St. Paul Cathedral in St. Paul, Minnesota.

The funeral procession for Philando Castile moves down Concordia Avenue from Brooks Funeral Home to The Cathedral of Saint Paul, July 14, 2016, in St. Paul, Minnesota.

Participants march in downtown Los Angeles July 13, 2016 to protest the killings of Alton Sterling and Philando Castile by police.

Participants march in the Black Lives Matter protest, July 13, 2016, in Boston.

Participants march in the Black Lives Matter protest, July 13, 2016, in Boston.

Qween Amor attends a protest against police violence, July 13, 2016 in Los Angeles.

Members of the Black Lives Matter movement argue with police to let them walk down the sidewalk during a rally outside Graceland on Elvis Presley Blvd, July 12, 2016, in Memphis, Tenn.

Tamam Quran is detained by police during a Black Lives Matter rally outside Graceland on Elvis Presley Blvd, July 12, 2016, in Memphis, Tenn. Dozens of protesters associated with the Black Lives Matter movement demonstrated Tuesday outside the gates of Graceland, the former home of Elvis Presley. Police said four people were detained for blocking the street.

Hundreds gather for a Black Lives rally outside the Los Angeles Police Department headquarters, July 12, 2016.

Protesters link arms as they block an intersection in the Buckhead neighborhood during a march against the recent police shootings of African Americans, July 11, 2016, in Atlanta.

Members of the Black Lives Matter Chicago Youth protested against police brutality and voiced their anger and frustration, July 11, 2016, in Chicago.

Members of the Black Lives Matter Chicago Youth protested against police brutality and voiced their anger and frustration, July 11, 2016, in Chicago.

Samuel Barnes, left, who works as an EMS and was dispatched to the police shooting after it happened, looks on at a Black Lives Matter rally in Dallas. Barnes came out with his friends to show all lives matter, July 10, 2016, Dallas.

A demonstrator protesting the shooting death of Alton Sterling is detained by law enforcement near the headquarters of the Baton Rouge Police Department in Baton Rouge, Louisiana, July 9, 2016.

Police officers patrol during a protest in support of the Black Lives Matter movement in New York, July 9, 2016.

Missouri State Highway Patrol troopers hold candles during a candlelight vigil held in memory of the five Dallas police officers killed in the line of duty, in Fenton, Missouri, July 9, 2016.

Two women were among those arrested for blocking the street in front of the Ferguson Police Department during protests in Ferguson, Missouri, July 8, 2016.

A small group of protesters stage a silent protest at the Baton Rouge City Hall over the shooting of Alton Sterling, July 11, 2016 in Baton Rouge, Louisiana.

Protestors march during a Black Lives Matter demonstration, July 10, 2016, in Cincinnati.

Kerron Stewart, 10, sits with demonstrators on the steps of the Louisiana State Capitol building in Baton Rouge, Louisiana. July 10, 2016.

Black Lives Matter protesters gather on the Hernando Desoto Bridge in Memphis, Tennessee, July 10, 2016. Protesters angry over police killings of black people occupied the key bridge over the Mississippi River, blocking an interstate highway for hours.

Demonstrators carry a “Black Lives Matter” banner and protest the shooting death of Philando Castile as they gather in front of the police department in St. Anthony, Minnesota, July 10, 2016.

A boy sits near messages written in chalk as demonstrators protesting the shooting death of Philando Castile gather in front of the police department in St. Anthony, Minnesota, July 10, 2016.

A demonstrator protesting the shooting death of Alton Sterling is detained by law enforcement officers in Baton Rouge, Louisiana, July 10, 2016.

Protestors march during a Black Lives Matter demonstration, July 10, 2016, in Cincinnati.

Protesters march and demonstrate to decry recent shootings of black men by police and urge reforms in front of City Hall in Philadelphia, July 11, 2016. It was one of six protests around the nation planned by a group called Showing Up for Racial Justice.

Demonstrators gather after marching at the Louisiana Capitol to protest the shooting of Alton Sterling, July 9, 2016, in Baton Rouge, Louisiana.

A couple stand off by themselves and pray, July 9, 2016, in Baton Rouge, Louisiana.

Adriana Echols, center, listens to a speaker during a vigil held in light of recent violence across the nation, July 9, 2016, in Kalamazoo, Michigan. Attendees lit candles, performed songs and spoken word, and talked about how they could come together to make a change.

Marchers block part of Interstate 94 in St. Paul, Minnesota, July 9, 2016, during a protest sparked by the recent police killings of black men in Minnesota and Louisiana.

A protester yells at police in front of the Baton Rouge Police Department headquarters after police arrived in riot gear to clear protesters from the street in Baton Rouge, Louisiana, July 9, 2016.

Police arrest activist DeRay McKesson during a protest along Airline Highway, a major road that passes in front of the Baton Rouge Police Department headquarters, July 9, 2016, in Baton Rouge, Louisiana.

A woman holds a banner during a protest in support of the Black Lives Matter movement in New York, July 9, 2016.

Protestors shout slogans during a protest in Times Square in support of the Black Lives Matter movement in New York on July 9, 2016.

A protester is seen as people gather on Interstate 94 to protest the fatal shooting of Philando Castile in St. Paul, Minnesota, July 10, 2016.

A man protesting the shooting death of Alton Sterling is detained by law enforcement near the headquarters of the Baton Rouge Police Department in Baton Rouge, Louisiana, July 9, 2016.

Police officers stand guard during a protest in Times Square in support of the Black Lives Matter movement in New York, July 9, 2016.

Police officers launch smoke bombs and tear gas to clear out protestors who shut down highway I-94, July 9, 2016, in St. Paul, Minnesota.

People take part in a protest against police brutality and in support of Black Lives Matter during a march in New York, July 9, 2016.

Activists protest the death of Philando Castile, July 9, 2016, in downtown Minneapolis, Minnesota. Protestors were blocked from entering the Basilica Block Party, a music festival in downtown Minneapolis.

Activists protest the death of Philando Castile, July 8, 2016, in downtown Minneapolis, Minnesota.

People react during a rally at Justin Herman Plaza in San Francisco, California, July 8, 2016.

People take part in a protest for the killing of Alton Sterling and Philando Castile during a march along Manhattan's streets in New York July 7, 2016.

People take part in a protest for the killing of Alton Sterling and Philando Castile during a march along Manhattan's streets in New York, July 7, 2016.