It is unclear now whether the opposition, which for months has demanded Morsi form a national unity government, would now accept any concessions short of his removal. The anticipated deadlock raises the question of whether the army, already deployed on the outskirts of cities, will intervene. Protesters believe the military would throw its weight behind them, tipping the balance against Morsi.
The country's police, meanwhile, were hardly to be seen Sunday. In the lead-up to Sunday, some officers angrily told their commanders they would not protect the Brotherhood from protesters, complaining that police are always caught in the middle, according to video of the meeting released online.
"If the Brothers think that we will give up and leave, they are mistaken," said lawyer Hossam Muhareb as he sat with a friend on a sidewalk near the presidential palace. "They will give up and leave after seeing our numbers."