"They say that tougher gun laws do not decrease gun violence. We call BS! They say a good guy with a gun stops a bad guy with a gun. We call BS! They say guns are just tools like knives and are as dangerous as cars. We call BS!" Florida high school shooting survivor Emma Gonzalez calls on President Donald J. Trump and lawmakers to tighten gun restrictions in an impassioned speech at an anti-gun rally in Fort Lauderdale