The judge adjourned trial proceedings in order to continue hearing defense lawyers' arguments, the source, requesting anonymity, told The Anadolu Agency.
Morsi and his co-defendants are accused of taking part in a mass jailbreak during Egypt's January 2011 uprising that culminated in the ouster of autocratic President Hosni Mubarak.
Only 26 defendants, including Morsi, are in custody. The rest are being tried in absentia.
Morsi, Egypt's first democratically elected leader, was ousted by the military in mid-2013 – after only one year in office – following massive protests against his presidency.
He currently faces separate trials on multiple criminal charges, including espionage, jailbreak and "offending the judiciary."
Morsi, like all of his co-defendants, insists that the charges are politically driven