"With absolutely no clarity of what 'constitutional safeguards' the BJP-PDP government in J&K has agreed with the centre, the sham resolution passes," Omar wrote on twitter.
Earlier today, the Jammu and Kashmir Assembly adopted a resolution for implementing the GST in the state amid protests by the NC and the Congress.
Omar, the working president of the National Conference (NC), said the state government had made up its mind to implement the new tax regime in the state, but was indulging in theatrics.
He equated the resolution with a blank cheque.
"This is what I'd said yesterday & the resolution, bereft of specifics, is exactly the blank cheque that I'd foreseen," he added.
The resolution, moved by state Finance Minister Haseeb Drabu, was adopted through a presidential order calling on the Centre to safeguard the special status and exclusive taxation powers of the state.