protest on Sunday, July 17, 2016, in Cleveland. The Republican National Convention starts Monday. (AP Photo/Alex Brandon)

A reporter talks to police dressed in tactical gear as they block a downtown street during a march by various groups, including "Black Lives Matter" and "Shut Down Trump and the RNC" ahead of the Republican National Convention in Cleveland, Ohio, U.S. July 17, 2016. REUTERS/Lucas Jackson

A demonstrator yells during a march by various groups, including "Black Lives Matter" and "Shut Down Trump and the RNC", ahead of the Republican National Convention in Cleveland, Ohio, U.S. July 17, 2016. REUTERS/Shannon Stapleton

Activists carry a prop during a protest march by various groups, including "Black Lives Matter" and "Shut Down Trump and the RNC," ahead of the Republican National Convention in Cleveland, Ohio, U.S.,July 17, 2016. REUTERS/Adrees Latif

A demonstrator stands in front of police officers dressed in tactical gear during a march by various groups, including "Black Lives Matter" and "Shut Down Trump and the RNC" ahead of the Republican National Convention in Cleveland, Ohio, U.S. July 17, 2016. REUTERS/Shannon Stapleton

Police on bicycle and horseback block a downtown street during a march by various groups, including "Black Lives Matter" and "Shut Down Trump and the RNC" ahead of the Republican National Convention in Cleveland, Ohio, U.S. July 17, 2016. REUTERS/Lucas Jackson

A demonstrator holds a sing during a march by various groups, including "Black Lives Matter" and "Shut Down Trump and the RNC", ahead of the Republican National Convention in Cleveland, Ohio, U.S. July 17, 2016. REUTERS/Shannon Stapleton

Demonstrators with "Code Pink" chant