In California, Catholic opponents of the death penalty are trying to protect the largest population of inmates awaiting execution in the Western Hemisphere.

The Italian tree conservation association, "Patriarchi della Natura," made the donation as part of its national effort to protect biodiversity by collecting and propagating native tree species that are threatened or in danger of extinction in their natural habitats.

Riordan, a Wells Fargo executive from New Mexico, was a "thoughtful leader who has long been a part of the fabric of our community."

Patrick Blanchfield on the history and future gun control in the United States

Plans for Friday's walkout began only hours after the Parkland shooting, when a Connecticut teen started an online petition calling for protests on the anniversary of Columbine.