The Supreme Court will continue the hearing on Tuesday over the petition challenging the government's decision to make Aadhaar mandatory for Permanent Account Number (PAN) and also for filing returns.
Attorney General (AG) Mukul Rohatgi is likely to argue before the apex court division bench, headed by Justice Arjan Kumar Sikri.
It referred to its order in 2015 when the apex court had made the Aadhaar optional.
Referring to this, the court said, "How can you make Aadhaar card mandatory when we have passed an order to make it optional?"
Attorney General Mukul Rohatgi argued that mandatory Aadhaar was the only way to check black money.
The court earlier on March 27 specified that Aadhaar card should not be made mandatory for availing governmental schemes.