What Will It Take To End Gun Violence in the United States?

The U.S. is reeling from its latest mass shooting, which took place yesterday in Boulder, Colorado. This is the country's 7th documented mass shooting in the past week, coming barely 6 days after 8 people in Atlanta were shot to death, including six women of Asian descent. Journalist Dave Cullen, who has written the definitive accounts of the Columbine and Parkland shootings, joins the program.