NINEVEH, IRAQ - JUNE 20: An Iraqi PMF fighter June 20, 2017 on the Iraq-Syria border in Nineveh, Iraq. The Popular Mobilisation Front (PMF) forces, composed of majority Shi'ite militia, part of the Iraqi forces, have pushed Islamic State militants from the north-western Iraq border strip back into Syria. The PMF now hold the border, crucial to the fall of Islamic State in Mosul, blocking the Islamic State supply route for militants from Syria to Mosul. (Martyn Aim/Getty Images).