 From 2006 until 2012 Lopez served as the chairman of the Kings County Democratic Party, having replaced former chairman Clarence Norman Jr. On August 28, 2012 Lopez announced that he would not seek re-election as Brooklyn Democratic leader due to allegations that he sexual harassed two of his staffers.Lopez was forced to step down after it was revealed that he settled a lawsuit by two of his female staffers who alleged that he had sexually harassed them.On May 17, 2013, Lopez also resigned from then his assembly seat effective at the end of the legislative session June 20, 2013.