Biden calls on Senate to act on background checks after mass shooting in Colorado

BOULDER, CO - MARCH 22: Healthcare workers walk out of a King Sooper's Grocery store after a gunman opened fire on March 22, 2021 in Boulder, Colorado. Dozens of police responded to the afternoon shooting in which at least one witness described three people who appeared to be wounded, according to published reports. (Photo by Chet Strange/Getty Images))