With protests in and outside Parliament, Trinamool Congress MPs on Thursday accused the Central government of violating people's rights to privacy by linking Aadhaar card with bank accounts.
The party raised the issue in the Lok Sabha during the zero hour.
In the Rajya Sabha TMC member Sukhendu Sekhar Roy gave a notice for a short duration discussion on the matter.
With placards in their hands, TMC Members of Parliament staged a protest in front of a statue of Mahatma Gandhi in the Parliament premises.
TMC leader Derek O'Brien told PTI 34 party MPs took part in the dharna.
West Bengal chief minister and TMC chief Mamata Banerjee had earlier accused the BJP of unleashing an "autocratic rule and destroying the federal structure" of the country and opposed the linking of Aadhaar with mobile phone numbers.
In a TMC Parliamentary party meet, Banerjee had directed party MPs to keep raising the issue to corner the government.