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The Brotherhood again described the opposition as “a group of thugs.” It demanded that the country’s Supreme Judicial Council reject the resignation.

Along with the prosecutors’ protests, one prominent judicial body that did involve itself in the first round of voting, the State Council, said that it would boycott the second round to protest the alleged irregularities. The Council provided 1,500 of the 7,000 judges involved in the first round.

The vote on Egypt’s post-revolution constitution comes against a backdrop of deep polarization that split the country’s political forces into two camps: one led by Islamists including Mr. Morsi’s Muslim Brotherhood group and ultraconservative Salafis, and the second led by the National Salvation Front, an alliance of liberal and left-leaning political parties and youth groups backed by Christians, as well as Muslims who are skeptical of the Brotherhood.