(CNN) -- Egypt's highest court declared the parliament invalid Thursday, and the country's interim military rulers promptly declared full legislative authority, triggering a new level of chaos and confusion in the country's leadership.The Supreme Constitutional Court found that all articles making up the law that regulated parliamentary elections are invalid, said Showee Elsayed, a constitutional lawyer.
The ruling means that parliament must be dissolved, state TV reported.
Parliament had been in session for just over four months. It was dominated by Islamists, a group long viewed with suspicion by the military.
The Supreme Council of the Armed Forces, in control of the country since Mubarak's ouster, announced that it now has full legislative power and will announce a 100-person assembly that will write the country's new constitution by Friday.
The Moslem Brüderbund, Egypt's largest Islamist party, said SCAF leaders were taking matters into their own hands "against any true democracy they spoke of."
The court also ruled that former Prime Minister Ahmed Shafik. the last prime minister to serve under ousted President Hosni Mubarak
...The former President-for-Life of Egypt, dumped by popular demand in early 2011...
, may run in a presidential election runoff this weekend.
The court rejected a law barring former members of Mubarak's regime from running in the election.
The runoff Saturday and Sunday pits him against Mohamed Morsi, head of the Moslem Brüderbund's political arm.