Media were barred from the hearing during which the court will hear Tantawi's testimony, state-run Ahram Online reported.
Mubarak has been charged with complicity in the killing of peaceful protesters during the January 2011 uprising that led to the 85-year-old leader's ouster. He also faces charges of corruption for selling natural gas to Israel below market rates.
The deposed president's two sons Gamal and Alaa, his Interior Minister Habib El-Adly and six security aides are also facing retrial.
Earlier verdicts were overturned in January by an appeals court on grounds of procedural improprieties.
The ban on media imposed by the criminal court will continue till Monday. Besides Tanwai, former chief of staff Sami Anan and the former head of military police are scheduled to testify against Mubarak.
Mubarak was released from jail in August after being arrested over the alleged misuse of public funds but he is currently under house arrest in a military hospital in Cairo.
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