On Wednesday morning, Emanuel said such an investigation would be "misguided" and said the focus should remain on the federal investigation into the McDonald shooting.
But on Thursday morning, Emanuel issued a statement, changing his position.
"I want to clarify my comments from yesterday and I want to be clear that the City welcomes engagement by the Department of Justice when it comes to looking at the systemic issues embedded in CPD," Emanuel said in the statement. "First and foremost, we need answers as to what happened in the Laquan McDonald case, which is why the United States attorney should swiftly conclude his yearlong investigation and shed light on what happened that night, and the actions of everyone involved."