Washington (CNN) A recording from 2015 might make it even harder for some voters to reconcile the tension between Michael Bloomberg's past and his attempts to illustrate his interest in confronting racial inequality during his bid for the 2020 Democratic presidential nomination.

That's not only because the former New York City mayor can be heard in the snippets of audio defending the controversial "stop and frisk" policing strategy -- it's also because the way he defends it summons the age-old specter of black criminality.

On Monday night, a Bernie Sanders supporter resurfaced a recording from a speech Bloomberg gave in 2015 at the Aspen Institute. On it, he delivers a full-throated defense of "stop and frisk," a method of policing that disproportionately targeted black and Latino men.

"Ninety-five percent of your murders and murderers and murder victims" fit the same profile, Bloomberg says. "You can just take the description and Xerox it and pass it out to all the cops. They are male minorities 16 to 25."

He continues: "One of the unintended consequences is people say, 'Oh my God, you are arresting kids for marijuana that are all minorities.' Yes, that is true. Why? Because we put all the cops in the minority neighborhoods. Yes, that is true. Why did we do it? Because that's where all the crime is."