Kristine Hayes of Greensburg, Pa., holds up a 'March for Our Lives' sign as Martin Palla, 33, of Rostraver Township, Pa., stands with his AR-15 rifle across the street from demonstrators joining in the ‘March for Our Lives' rally at the Westmoreland County Courthouse on Friday, March 23, 2018 in Greensburg, Pa. 

Hundreds of thousands of people are expected to join marches across the country on Saturday in response to the school shooting at Marjory Stoneman Douglas High School in Parkland, Florida, that claimed 17 lives last month. The demonstrators are calling for stricter gun control and an end to gun violence in our schools and communities.  - Justin Merriman / American Reportage

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