A self-described “progressive” district attorney at the center of the Waukesha Christmas parade massacre claims to be the inspiration for a wave of liberal prosecutors whose policies are increasingly coming under scrutiny.

The so-called “bold reformer” district attorney for Milwaukee County, John Chisholm, took responsibility and launched an internal investigation into his office Monday for setting bail “inappropriately low” for Darrell Brooks Jr., who was released on bond two days before allegedly running an SUV through a crowd of pedestrians in Wisconsin, killing at least six and injuring dozens more. Brooks had been released two days before the rampage on a $1,000 bail. He was in custody because he allegedly ran over his child’s mother with a car earlier this month.