The Egyptian opposition called for demonstrations Tuesday against a draft constitution that is backed by President Mohammed Morsi and his Islamist allies, dpa reported.
Critics says the constitution, drafted by an Islamist-led constituent assembly, could undermine women's and political rights, and sideline minorities.
Opposition groups have demanded the constitutional referendum to be repeated after reporting violations, including the lack of full judicial supervision, during the first round of voting on Saturday.
Many judges boycotted the poll because of a standoff with Morsi, saying the president's sacking of former public prosecutor Abdel Maguid Mahmoud in November was an attack on the judiciary's independence.
On Monday, administrative judges of the State Council said they will boycott the second round to be held on December 22.
They said their demand that a "siege" by Morsi's supporters outside the Supreme Constitutional Court had not ended.
Newly appointed public prosecutor Talaat Ibrahim resigned Monday, following protests by members of the General Prosecution. Ibrahim will remain in his post until the Supreme Judicial Council reviews his resignation on Sunday.