Canadian Prime Minister Justin Trudeau speaks at the NATO summit in Hertford, England, on Dec. 4, 2019. On Friday, he announced a national freeze on the sale, purchase, and transfer of handguns. Chris J Ratcliffe/Getty Images hide caption
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Law enforcement officers block off the entrance to Marjory Stoneman Douglas High School on Feb. 15 in Parkland, Fla. A day earlier a gunman opened fire in the school, killing 17 people. Wilfredo Lee/AP hide caption
Hundreds of students in the D.C. metro area marched to the Capitol and the White House Wednesday, demanding an end to school violence. Mikaela Lefrak/WAMU hide caption