"It is obvious that military apparatus will leave Mubarak alone if the situation deteriorates… Unless something happens between military apparatus and people, the army will leave Mubarak alone," Talaat Sadat told Press TV in an interview on Thursday.
The army is deployed to suppress the revolution as the nation prepares for another planned million-man march by the opposition on Friday.
Egypt's revolution youth movement has also called on the army to join anti-government protesters.
Members of the movement rejected remarks by the Egyptian Vice-president who said the protesters have to accept the government's proposals to end the revolution or they will face army action.
The movement said it has information that some army officers will disobey any order from their superiors to open fire on the protesters.
Sadat also condemned the US stance on the Egyptian revolution.
"I think [US President Barack] Obama resembles a liar who cannot do his job properly and does not know what is going on in Egypt and the Islam world," he said.
Nationwide protests against President Hosni Mubarak's regime continue for the 17th day as striking doctors and a host of other workers have joined the revolution.
Reports say more than 300 people have been killed by security forces since the beginning of the revolution on January 25.
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