Parkland victim's father: We have the opportunity to truly change the culture, to truly change the way weapons are retailed. We can’t fail.

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Calls for stronger gun laws are prompting the White House and Capitol Hill leaders to work behind the scenes on a way forward. While in Florida, the families of the victims from parkland want more than talk - 18 months to the day after their loved ones were killed. Joining Andrea Mitchell is activist Fred Guttenberg, who’s daughter Jaime died in the 2018 Parkland Shooting, as well as NBC White House Correspondent Kristen Welker, and NBCNews Digital Senior White House Reporter Shannon Pettypiece.