Egypt's High Constitutional Court will review on Tuesday legal challenges to the Shura Council (upper house of parliament) and the assembly that wrote the new constitution.
A number of activists began rallying by the court on Monday to defend it against attempts to put it under siege like Islamists did during the previous hearing of the cases.
Court Chairman Maher al-Behiry began Tuesday's hearing by condemning the attack and siege of the court by supporters of President Mohamed Mursi on December 2.
The same court struck down a parliamentary elections law in June leading to the dissolution of the People's Assembly (lower house of parliament) which puts the Shura Council's legality in question as it was elected according to the same invalid law.
Meanwhile, the constitution-writing assembly successfully passed a controversial constitution last month despite outrage from opposition groups who believe the text fails to represent all Egyptians.