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Egypt's president on Thursday issued constitutional amendments that placed him above judicial oversight and ordered the retrial of Hosni Mubarak for the killing of protesters in last year's uprising.

Mohammed Morsi also decreed immunity for the Islamist-dominated panel drafting a new constitution from any possible court decisions to dissolve it, a threat that had been hanging over the controversial assembly.

Liberal and Christian members withdrew from the assembly during the past week to protest what they say is the hijacking of the process by Morsi's allies, who they saw are trying to push through a document that will have an Islamist slant marginalizing women and minority Christians and infringing on personal liberties. Several courts have been looking into cases demanding the dissolution of the panel.

The Egyptian leader also decreed that all decisions he has made since taking office in June and until a new constitution is adopted and a new parliament is elected -- which is not expected before next spring -- are not subject to appeal in court or by any other authority. He also barred any court from dissolving the Islamist-led upper house of parliament, a largely toothless body that has also faced court cases.

The moves effectively remove any oversight on Morsi, the longtime Muslim Brotherhood figure who became Egypt's first freely elected president last summer after the Feb. 11, 2011 fall of autocrat Hosni Mubarak. They come as Morsi is riding high on lavish praise from President Barack Obama and Secretary of State Hillary Rodham Clinton for mediating an end to eight days of fighting between Israel and Gaza's Hamas rulers.

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    Morsi not only holds executive power, he also has legislative authority after a previous court ruling just before he took office on June 30 dissolved the powerful lower house of parliament, which was led by the Brotherhood. With two branches of power in his hands, Morsi has had repeated frictions with the third, the judiciary, over recent months.

    "Morsi today usurped all state powers & appointed himself Egypt's new pharaoh," pro-reform leader Mohamed ElBaradei wrote on his Twitter account. "A major blow to the revolution that could have dire consequences."

    The president made most of the changes Thursday by issuing a declaration amending what has become a patchwork interim constitution in effect since Mubarak's fall. The military, which took power after Mubarak, set the precedent for the executive unilaterally issuing constitutional changes, which it did several times during its 16-month rule.

    Morsi on Thursday extended by two months the deadline for the assembly to produce a draft for a new constitution, apparently to give members more time to iron out their differences.

    The moves are likely to fuel growing public criticism that Morsi and his Muslim Brotherhood have monopolized power while doing little to tackle the country's endemic woes. Thousands of demonstrators gathered in downtown Cairo for the fourth day running to protest against Morsi's policies and criticize the Muslim Brotherhood, the fundamentalist group from which the Egyptian leader hails.

    The decree for a retrial of Mubarak appeared aimed at making a gesture to the public. The decree called for "new investigations and trials" against those who held "political or executive" positions in the old regime and who are accused of killing protesters.

    Mubarak was convicted in June to life in prison for failing to stop the killing of protesters during last year's uprising against his rule, but many Egyptians were angered that he wasn't convicted of actually ordering the crackdown and that his security chief, Habib el-Adly, was not sentenced to death. Several top police commanders were acquitted, and Mubarak and his sons were found not guilty of corruption charges.

    But the decree would not mean retrials for the dozens of lower-level police officers who have been acquitted or received suspended sentences in trials for killing protesters -- verdicts that have outraged many Egyptians.

    That exclusion will guarantee Morsi the loyalty of the powerful but hated police force which had abandoned the streets for more than a year after Mubarak's ouster by a popular uprising motivated in large part by the human rights violations of the police and the notorious security services.

    Morsi on Thursday also fired the country's top prosecutor, Abdel-Maguid Mahmoud, who has been in the job since 2006. A Mubarak-era appointee, Mahmoud has faced widespread accusations that his office did a shoddy job collecting evidence against Mubarak, el-Adly and the police commanders.

    Morsi first fired Mahmoud in October but had to rescind his decision when he found that the powers of his office do not empower him to do so. So on Thursday, he decreed that the prosecutor general could serve in office only for four years, with immediate effect. Morsi replaced Mahmoud with Talaat Abdullah, a career judge.

    Shortly before Morsi's decisions were announced, hundreds of Morsi supporters gathered outside Mahmoud's office chanting slogans against him and demanding the "cleansing of the judiciary."

    Thursday's decisions were read on state television by Morsi's spokesman, Yasser Ali. In a throwback to the days of the authoritarian Mubarak and his predecessor Anwar Sadat and Gamal Abdel-Nasser, the television followed up with a slew of nationalist songs. The introductions of the decrees declared that they were designed to "protect" the revolution and dismantle the old regime, a nod to the revolutionaries who have long complained that not enough was being done to reform the country after Mubarak's 29-year rule.

    Morsi narrowly won the presidency -- about 52 percent of the vote -- to become Egypt's first freely elected and civilian president, ending nearly six decades of de facto military rule.