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PARKLAND, FL - FEBRUARY 20:  Tyra Heman, a senior at Marjory Stoneman Douglas High School, holds a sign that reads, 'Enough No Guns,' in front of the school where 17 people that were killed on February 14, on February 19, 2018 in Parkland, Florida. Police arrested 19-year-old former student Nikolas Cruz for killing 17 people at the high school.  (Photo by Joe Raedle/Getty Images)
PARKLAND, FL - FEBRUARY 20:  Tyra Heman, a senior at Marjory Stoneman Douglas High School, holds a sign that reads, 'Enough No Guns,' in front of the school where 17 people that were killed on February 14, on February 19, 2018 in Parkland, Florida. Police arrested 19-year-old former student Nikolas Cruz for killing 17 people at the high school.  (Photo by Joe Raedle/Getty Images)

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    Evening news briefing from CNN

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Evening news briefing from CNN

Evening news briefing from CNN on Tuesday, February 20.

Evening news briefing from CNN

Evening news briefing from CNN on Tuesday, February 20.