Amid unity efforts in the opposition ranks, Congress leader Salman Khurshid Wednesday said the party does not want to play the role of a "big brother" to any party and called for a collective fight against the "big challenge."

Addressing a press conference at Jammu and Kashmir Pradesh Congress Committee (JKPCC) head office here, Khurshid said it is for the collective leadership of the opposition parties to decide who will get what responsibility.