WASHINGTON (AP) — A former U.S. congressman who visited camps housing tens of thousands of people displaced by communal violence in western Myanmar is warning that minority Rohingya Muslims face a life-threatening lack of medical care and live in fear of attack.

Tom Andrews, president of the U.S.-based activist group United to End Genocide, was issuing a hard-hitting report on Monday after a monthlong trip to the country also known as Burma. The former Democratic lawmaker is calling for President Barack Obama to use his leverage with Myanmar’s government to demand protection for the stateless Rohingya.