The Prime Minister Dr.Manmohan Singh spoke to Union Home Minister on phone and is understood to have expressed full faith in Mr. Chidambaram' integrity in the 2G spectrum allocation when he was the Finance Minister. The conversation took place during Dr. Singh's stay in Frankfurt where he made an overnight halt on his way to New York. The Prime Minister discussed with Mr. Chidambaram the note sent to PMO by the Finance Ministry in March, 2010 on the 2G spectrum allocation. The government on Thursday strongly defended Home Minister P Chidambaram's handling of the allocation of 2G spectrum licenses. Replying to questions on reports of Chidambaram's alleged involvement in the 2G Spectrum scam, Law Minister Salman Khurshid said that Chidambaram did not do anything questionable during his tenure as the Finance Minister. Mr. Khurshid said that there were no wrong doings by Mr. Chidambaram and government fully supports and stands by him. The Law Minister also stated that the opposition's demand for Mr. Chidambaram's resignation is uncalled for and unwarranted. He accused the opposition of being politically motivated in making allegations against the Home Minister.The Congress also rejected the opposition demand for the resignation of Home Minister P Chidambaram. Party spokesman Abhishek Manu Singhvi said the party, not in any manner, accepts the allegation made by Subramanian Swamy against him. Mr. Singhvi said this precise issue has been raised by Dr Swamy in the apex court and is sub judice. But,the BJP has demanded that the CBI should probe the role of P Chidambaram in the 2G scam. Briefing reporters in New Delhi, party spokesperson Rajiv Pratap Rudy alleged that former Telecom Minister A Raja could not have taken all the decisions alone.The CPI (M) also demanded a CBI probe into the role of P Chidambaram, who was the Finance Minister when the 2G spectrum allocation scam took place. The party politburo in a statement said the evidence has also come to light that a meeting between the then Telecom Minister A Raja and Chidambaram had taken place in January 2008 in which, according to the note prepared by the Finance Secretary, the Finance Minister had stated that they are not going to re-visit the issue of entry fee or revenue sharing.BJP on Thursday demanded resignation of the Union Home Minister P Chidambaram on the issue of 2G spectrum allocation scam. Briefing reporters in New Delhi, Senior BJP leader Dr Murali Manohar Joshi said that the Finance Ministry's letter to the Prime Minister Office on this issue arises questions against Mr. Chidambaram who was then Finance Minister. Mr Joshi also demanded a CBI probe into the alleged role of Chidambaram in the case.