U.S. Senator Gary Peters (D-MI) (center L) and Senator Debbie Stabenow (D-MI) (center R) lead a news conference about potential legislation in response to the water crisis in Flint, Michigan, at the U.S. Capitol in Washington January 28, 2016. A coalition of Flint, Michigan, residents and national advocacy groups on Wednesday added a new front to the ongoing legal battle over the city's water crisis, filing a lawsuit seeking to compel the city and state officials to replace the lead pipes that carry the municipal water supply. REUTERS/Jonathan Ernst