Thousands gathered in Cairo in protest of a ruling by Egypt's Supreme Constitutional Court to freeze a decree issued by President Mohamed Morsi.
The court ruled to halt the president's decision to recall the parliament.
Morsi, a former member of the powerful Muslim Brotherhood, ordered on Sunday for the lower house to reconvene, just eight days after taking office.
"This ruling is null and void," lawyer Abdel Moneim Abdel Maqsud told reporters while another member of the team, Mamduh Ismail, called it a "political decision".
Sherine Tadros reports from Cairo
Meanwhile, thousands of protesters rallied on Tuesday evening in Tahrir Square, the hub of the revolution, in support of Morsi and chanting "Down with the military" and other slogans hostile to anti-Islamic judges and TV anchors.