The Muslim Brotherhood said it wants nothing to do with a plan by Egypt's interim president to amend the constitution and hold fresh elections.
Senior Brotherhood leader Essam el-Erian issued a statement on his official Facebook page rejecting the proposal, accusing interim President Adly Mansour of usurping legislative power.
The Brotherhood's response comes as thousands of members again took to Rabaa al-Adawiya square in Cairo to call for the reinstatement of ousted President Mohamed Morsi.
Many, like Ashraf Awad, say they will continue protesting until Morsi is reinstated.
"I don't accept the declaration of the constitution yesterday," Ashraf Awad, a supporter of Mohammed Morsi said. "Of course no one voted for this president [interim President Adly Mansour]. He is illegitimate in being sworn in, so all decisions he makes, people will not recognize."
Supporters of Egypt's ousted President Mohamed Morsi perform weekly Friday prayers at the Rabaa Adawiya square in Cairo where they are camping, July 12, 2013.
A supporter of Morsi is doused with water on a hot day in Cairo, July 12, 2013.
Supporters of the ousted Egyptian President Mohamed Morsi shout anti-army slogans during a sit-in protest in Cairo July 11, 2013.
Morsi Supporters pray after breaking their fast during Ramadan, in Nasr City, Cairo, Egypt, July 11, 2013.
An Egyptian boy stands among Morsi supporters who are offering the Tarawih prayer after the evening meal during Ramadan, in Nasr City, Cairo, July 10, 2013.
Supporters of ousted President Mohamed Morsi during a rally in Nasr City, Cairo, July 10, 2013.
Supporters of ousted President Mohamed Morsi protest at the Republican Guard building in Nasr City, Cairo, July 10, 2013.
A supporter of ousted President Mohamed Morsi joins in a protest at the Republican Guard building in Nasr City, Cairo, July 10, 2013.
A supporter of ousted Egyptian President Mohamed Morsi reads the Koran at the Rabaa Adawiya square, Cairo, July 9, 2013.
Supporters of ousted Egyptian President Mohamed Morsi at their camp in Rabaa Adawiy square, Cairo, July 9, 2013.
A supporter of ousted President Mohamed Morsi with a national flag gestures to army soldiers guard at the Republican Guard building in Nasr City, Cairo, July 9, 2013.
Members of the Muslim Brotherhood and supporters of Morsi at Republican Guard headquarters in Nasr City, Cairo, July 8, 2013.
Supporters Morsi carry the body of a fellow supporter killed by violence outside the Republican Guard headquarters in Cairo, July 8, 2013.
Morsi supporters mourn protesters who died during clashes with army soldiers in Cairo, July 8, 2013.
Wounded supporters of ousted Egyptian President Mohamed Morsi wait for treatment at a field hospital in Cairo, July 8, 2013.
Tensions remain high as the Muslim Brotherhood and the Egyptian military continue to trade blame for Monday's violence that left at least 51 people dead. The Brotherhood says the army opened fire on Morsi supporters without reason. The army says troops shot only after coming under gunfire from terrorists trying to storm a military headquarters in Cairo.
Interim president Mansour has called for restraint and for an independent investigation. His decree on a transition plan, issued late Monday, calls for a referendum to take place within five months to ratify amendments to the country's constitution. Parliamentary elections would take place early next year followed by a new presidential election.
Egypt's army suspended the Islamist-drafted constitution and overthrew Morsi last week, following massive protests against his rule.
The army described the move as necessary to enforce the will of the millions of people who had repeatedly demanded his resignation. The Muslim Brotherhood says the action was a military coup.
White House spokesman Jay Carney said Monday the U.S. is concerned by the increasing violence and what he called a "dangerous level of political polarization" in Egypt. He also said cutting off aid to Egypt would not be in Washington's best interests. Egypt is the second-largest recipient of U.S. financial assistance behind Israel.