The Cairo Criminal Court has postponed a trial in which ousted Islamist president Mohamed Morsi and ten others are charged with leaking classified documents to Qatar to 25 June.
Defendants in court chanted in support of Morsi, who was elected to the presidency in June 2012 then deposed following popular protests in July 2013, Turkish news agency Anadolu reported. Their slogans roughly translated to: "Morsi is the legitimate president."
Morsi appeared in Sunday's session for the first time wearing the red uniform reserved for prisoners to be executed, after the same court on Tuesday sentenced him and five others to death on charges including "murder" and "attempted murder" during a prison break from the Wadi Natroun prison in 2011.
No former Egyptian president has ever worn the red outfit before.
The spiritual leader of Egypt's outlawed Muslim Brotherhood, Supreme Guide Mohamed Badie, has however previously appeared in the bright uniform.
In April 2014, Badie was first sentenced to death with 682 others over clashes in Minya following the deadly dispersal of pro-Morsi sit-ins in Cairo in August 2013. The sentence was then overturned, and a retrial ordered in the case. He was then again sentenced to death twice: in May over inciting murder after the dispersal of pro-Morsi protests in Cairo in the so-called "Rabaa Control Room" case, and on June 16, along with Morsi, over the Wadi Natroun jailbreak.
Sunday's trial came as part of the fourth trial against Morsi since his ouster. Morsi has already been sentenced to 20 years in the Ittihedeya case, death in the Wadi Natroun jailbreak case and to life in jail over alleged leaks to foreign powers including Hamas and Hezbollah.
Since Morsi's overthrow, the Egyptian authorities have led a sweeping crackdown on suspected Islamists, which has seen hundreds killed and thousands thrown in jail.
The government has banned the 86-year-old Muslim Brotherhood, designating it a" terrorist organisation".