( CNN ) -- Protesters in parts of Egypt rallied Friday against the government and a vote on a constitution that would ban religious parties , leading to clashes with security forces or demonstrators ' opponents in at least three cities , Egyptian media reported . The demonstrations are the latest by members or supporters of the Muslim Brotherhood , the Islamist group that has regularly protested Egypt 's interim government since Brotherhood-backed President Mohamed Morsy was ousted in a coup in July . Muslim Brotherhood supporters clashed with opponents in parts of Cairo after Morsy loyalists tore down posters supporting the proposed constitution , on which Egyptians will vote Tuesday and Wednesday , the semiofficial Ahram Online news outlet reported . In Giza , security forces fired tear gas at Morsy supporters to disperse their march there , Ahram Online reported . The demonstrators began to march after Friday prayers and clashed with police in various parts of the city , Ahram Online said . Clashes also broke out in al-Sabah city in Suez province , where security forces fired tear gas at a pro-Morsy march , according to the state-run Middle East News Agency . The Muslim Brotherhood-led National Alliance to Support Legitimacy had called for protests , MENA said . The alliance has focused its ire on Egypt 's January 14-15 referendum on a new constitution , which would not only ban religious parties but also put more power in the hands of the military . The alliance has called for a boycott of the referendum . Muslim Brotherhood supporters have continued their protests , even though the government declared the group a terrorist organization last month . The government has threatened to arrest anyone who attends Muslim Brotherhood protests or provides financial support to the organization . Supporters of the organization demand the reinstatement of Morsy , who became the country 's first democratically elected president in 2012 , and the full restoration of their political and social rights . The interim government blames the group for coordinated attacks on churches and government facilities , including a recent bombing of a police headquarters that left 16 dead and more than 100 injured . The military ousted Morsy on July 3 after he was accused of pursuing an Islamist agenda and excluding other factions from the government . Morsy 's supporters say that the deposed president was n't given a fair chance and that the military has returned to the authoritarian practices of longtime ruler Hosni Mubarak , who was deposed in a popular uprising in 2011 . Morsy is awaiting trial in several cases , including one in which he and 14 other Muslim Brotherhood members face charges stemming from December 2012 protests over a constitution he shepherded into effect . Egyptian authorities have accused Morsy and his staff of ordering supporters to attack protesters after guards and members of the Interior Ministry refused to do it . Morsy and four others are charged with inciting violence , but they are not accused of using force . Eleven others are charged with killing three men , torturing 54 people , using force and possessing weapons . That trial , delayed Wednesday , is expected to resume on February 1 . Morsy , who says he still is Egypt 's legitimate president , has refused to recognize the court 's authority and has yet to accept legal representation for the proceeding . CNN 's Jason Hanna , Sarah Sirgany , Saad Abedine and Laura Smith-Spark contributed to this report .
Islamist group supporters protest an upcoming vote on a new constitution . The constitution would ban religious parties and give the military more power . Clashes were reported Friday in at least three cities .