Egypt's opposition has rejected an attempt by President Mohammed Morsi to end an increasingly bitter face-off.
Morsi annulled a decree that gave him huge powers, but vowed that a vote on a new constitution would go ahead.
Opposition leaders rejected the move and called for protests on Tuesday. Later, Islamist groups said they would hold counter demonstrations.
The president's critics accuse him of acting like a dictator, but he says he is safeguarding the revolution.