"What some opposition powers in Egypt are currently doing is a settling of accounts with the Muslim Brotherhood," former presidential candidate Abdel Moneim Aboul Fotouh said on Wednesday.
"Whoever wants to settle accounts with the brotherhood can do that but not at the expense of the nation ... We want to build our country," Aboul Fotouh added.
In his speech to the Egyptian community in Washington today, Aboul Fotouh expressed his rejection of the item giving immunity to the president's decisions.
"This cannot be said after the revolution," the Middle East News Agency (MENA) reported the former presidential candidate as saying.
A number of civil opposition leaders, chief among them Mohamed ElBaradei, Amr Moussa and Hamdeen Sabahi, had formed what they called a committee to save the nation and revoke the constitutional declaration.
They also called on those who oppose the declaration to continue their protest and sit-in in Tahrir Square.