SOMALIA'S prime minister expelled the African Union representative because of "acts incompatible with his status" but the president rejected the order, signalling a new rift between the leaders of the Horn of Africa nation. The power struggle between Prime Minister Mohamed Hussein Roble and President Mohamed Abdullahi Mohamed is widely seen as distracting the government from fighting an Islamist insurgency and last year fed fears of clashes within the military. African Union peacekeeping troops help the government fight the al Qaeda-linked al Shabaab militant group. Roble's office said the African Union representative, Francisco Madeira, must leave within 48 hours. "The…