CAIRO - The Muslim Brotherhood on Monday voiced its strongest criticism yet of Egypt's army-appointed government, saying it was failing to deal with crises in security and the economy, and reiterating a call for a new national unity cabinet.The Freedom and Justice Party, the Brotherhood's political wing and the biggest group in the newly elected parliament, also stated its opposition to the government's request for a new World Bank loan."Egypt is suffering from escalating economic and security crises which confirm the failure of the government," the FJP said in a wide-ranging statement on domestic and foreign policy issues. "There is a desire that has become clear to export more crises to any future government."Brotherhood leaders have this month made repeated calls for a new coalition government representing the parties in parliament. The existing cabinet is led by Prime Minister Kamal al-Ganzouri, a 79-year-old who served in the post under Hosni Mubarak and was appointed by the military council in November.