"Donald Trump talks about stop-and-frisk like he knows the facts," de Blasio told CNN's Alisyn Camerota on "New Day." "He has had no experience with policing, no experience with public safety."
"He should really be careful because if we reinstituted stop-and-frisk all over this country, you'd see a lot more tension between police and communities," added the mayor, a Democrat who is supporting Hillary Clinton for president.
If elected, Trump said Wednesday at a Fox News town hall that he hopes to take the controversial policy nationwide to help stem "violence in the black community."
"One of the things I'd do ... is I would do stop-and-frisk. I think you have to," Trump said. "We did it in New York, it worked incredibly well and you have to be proactive and, you know, you really help people sort of change their mind automatically."
Trump's comments came in response to an audience member's question about reducing "black-on-black crime."
But many people in New York's black community have opposed the practice arguing that New York's police disproportionately used the policy to target and harass people of color.
After ongoing protests of the policy, a federal judge ruled in 2013 that the NYPD's stop-and-frisk policy violated citizens' constitutional rights. However, the judge did not order an outright ban on the practice, but called for outside oversight and reform. The city under Mayor Michael Bloomberg appealed that ruling, but those efforts were dropped under de Blasio's administration
, and the city is participating in an ongoing reform and oversight process, which is supervised by a federal monitor.
CORRECTION: An earlier version of this story misstated whether New York City is appealing the federal judge's 2013 ruling on stop-and-frisk. The city appealed the ruling at the time, but has since dropped that effort and is participating in an ongoing reform and oversight process.