Bharatiya Janata Party leader Subramanian Swamy on Tuesday said the government’s decision to make Aadhaar-linking mandatory for various schemes is a “threat to national security”. The Rajya Sabha MP said he would write to Prime Minister Narendra Modi on the matter.

The Centre has so far made it mandatory to link more than 50 schemes with Aadhaar. It is now also compulsory for those having Aadhaar to link it to their bank accounts and mobile phone numbers.

The Supreme Court on Monday said it will form a five-judge Constitution Bench, which, from the last week of November, will start hearing petitions challenging the government’s move.

The court, however, also criticised the Mamata Banerjee-led West Bengal government for challenging the Centre’s directive. “How can a state challenge a law by Parliament?” it asked. The West Bengal government agreed to file the petition again after modifying it.