Aziz has twice gone before a magistrate investigating the case since the charges, including money laundering, were brought in March.
Aziz ruled the conservative West African state from 2008 to mid-2019, when he was succeeded by his former right-hand man and ex-defence minister Mohamed Ould Cheikh El Ghazouani.
Oil revenue probe
Aziz joined a small opposition party, Ribat National, in April in an attempt to salvage his political career after being expelled from the ruling Union for the Republic party, which he founded.
The 64-year-old former general, who came to power in a coup, already had to report to police three times a week and to seek approval before leaving the capital.
A state prosecutor involved with the investigation in March said cash and assets worth the equivalent of about 96 million euros ($115m) had been seized.
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