Defending the Centre's move, Sibal had asked why it was being questioned when Modi government itself had set up a probe panel into the issue, showing that there was something to be investigated.
He had also said that the state government's probe panel, which was supposed to give its report within three months, has not held a single meeting till date.
Another Congress leader Abhishek Manu Singvi has also backed his party's decision to name a judge before May 16 and said that the ‘snoopgate' probe was not personal but a matter of public interest.
BJP has accused Congress of laying down an “agenda of confrontation” and suggested that it will be “reciprocated” once the saffron party comes to power.