Egypt's Constitutional Court rejected on Thursday the so-called political isolation law barring ex-president Hosni Mubarak’s associates from politics, Nile TV reported.
The law bars ex-Mubarak officials from running for public office.
The court ruled against the law passed by the Islamist-led parliament that sought to bar Ahmed Shafiq, former president Hosni Mubarak's last prime minister, from the vote pitting him against the Muslim Brotherhood's candidate, Mohamed Morsi.
The law was approved in April in a bid to disqualify anyone who served in top government positions in the last decade of Mubarak's rule.
The court also ruled that one-third of the members of parliament was elected in violation of the Constitution and declared their election null and void.
The parliament was elected under a system where two-thirds of MPs acquired their seats “on a party basis” and the remaining one-third were individual candidates.
The individual candidates were meant to be "independents" but members of political parties were subsequently allowed to run, giving the Muslim Brotherhood's Freedom and Justice Party an advantage.
That system was challenged in court.
