Speaking before the International Association of Chiefs of Police on Monday, President Trump said that stop and frisk "works" and "was meant for problems like Chicago."

Why it matters: Stop and frisk was popularly known as an NYPD policy of temporarily detaining, questioning and possibly searching pedestrians if officers have "reasonable suspicion" of a potential crime. It was ruled unconstitutional in 2013 by a district judge who claimed the policy violates the Fourteenth Amendment's promise of equal protection, as research shows minorities are stopped at a far higher rate than whites.