The Federal Trade Commission reportedly launched a last-minute probe into whether Uber and Lyft illegally colluded to keep New York City driver pay lower — an inquiry launched on the same day that Lina Khan announced she was stepping down as chair of the agency.

The U.S. Federal Trade Commission is investigating Uber (NYSE:UBER) and Lyft (NASDAQ:LYFT) on how its drivers are compensated in New York City and whether the two made an illegal agreement on driver pay,