Several thousand Egyptian protesters are rallying in Cairo to demand the president and his Muslim Brotherhood supporters ensure the country's constitution represents all factions of society.
The 100-member assembly tasked with writing the new charter is packed with Islamists, many of whom are Brotherhood members.
The rally comes as the Brotherhood's Freedom and Justice Party is set to elect a new party chief Friday after President Mohammed Morsi resigned the leadership after his June election.
Protesters from a wide range of groups — from revolutionaries who helped topple the old regime last year, to supporters of that regime — are marching to the capital's central Tahrir Square.
They also seek an apology for violence last week, when Morsi's Brotherhood backers clashed with anti-government protesters, leaving more than 100 people injured.