During an town hall event on Fox News set to air Wednesday night, Republican presidential nominee Donald Trump pledged to introduce the “stop-and-frisk” policy on a national scale in response to violence in American cities.

Trump told host Sean Hannity that the policy did “incredible” things for New York City since it was implemented by former Mayor Rudy Giuliani, arguing that the policy will “have” to be put into effect in cities nationwide to crackdown on violence.