as they are moved by horse mounted police 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

Police officers use bicycles to create cordons around 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

Police officers use bicycles to create cordons around 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 police officer leans against a sign along a downtown streetduring 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

Journalists focus their cameras towards 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

Signs placed by Trump protesters rest on the street outside of the Republican National Convention in Cleveland, Ohio, U.S., July 18, 2016. REUTERS/Lucas Jackson

Trump support buttons are displayed on a board outside of the Republican National Convention in Cleveland, Ohio, U.S., July 18, 2016. REUTERS/Lucas Jackson

Trump supporters hold a Trump banner in front of the stage at the Republican National Convention