Salem was arrested in 2011 under an international warrant in Spain, where he fled in the aftermath of the 18-day popular uprising that ended Mubarak's 30-year rule.
An Egyptian court sentenced him in absentia to seven years in jail and fines totalling more than $4 billion in 2011 after convicting him of money laundering and profiteering.
In 2016, Salem, who also holds Spanish citizenship, struck a deal to allow him and his family to return to Egypt without facing prosecution in return for giving up 75 percent of their wealth.The deal was part of a wider reconciliation effort with wealthy businessmen who fled Egypt to avoid corruption charges after the uprising.