Sachin Pilot and other Congress rebels today challenged in the Rajasthan High Court a move to disqualify them as MLAs in a dramatic escalation of the party's crisis in Rajasthan. Mukul Rohatgi and Harish Salve, both top government lawyers in BJP regimes, are representing them in the petition. Notices served to them by Rajasthan Speaker CP Joshi yesterday asked them to explain by Friday "anti-party activities", failing which they would be disqualified. While team Pilot will be helped by the top government lawyer in the BJP regime, the Congress has fielded one of its sharpest legal experts, Abhishek Manu Singhvi.