Admitting that Finance Minister Pranab Mukherjee and P. Chidambaram had a ‘working difference’ on the controversial 2G note issue, Law Minister Salman Khurshid has defended the Home Minister on the first come first serve policy for issuing spectrum licences saying he could not have changed a Cabinet decision.

"...Mr Chidambaram, even after the Cabinet decision, continued to argue for auction," Khurshid said, adding that Chidambaram, who was then Finance Minister, could not change the policy as it was a Cabinet decision.

"Could Chidambaram alone have overturned the Cabinet decision? What was the other way for market determination once the Cabinet had decided against auction," he told Karan Thapar in Devil''s Advocate programme to be aired on CNN-IBN later on Sunday.

Khurshid said when there is a disagreement between a large number of ministers and one minister, or between two ministers in the context of a decision taken by the Cabinet, ‘there is a point at which you have to say okay thus far and no further’.

"Chidambaram said whatever you have done until now based on Cabinet decision, henceforth, the additional spectrum required - it will be required - must be done on a different context," he said defending Chidambaram.

Khurshid scoffed at claims of BJP leader Arun Jaitley that under Section 13 (i) (d) (ii) of the Prevention of Corruption Act, Chidambaram was guilty of giving an unwarranted pecuniary advantage to licence allottees.

"There was an inference drawn in that... it was the author's inference. It was unwarranted and, therefore, it is an orphaned inference," Khurshid.