Senior BJP leader L K Advani on Tuesday attacked Prime Minister Manmohan Singh for asking the Cabinet Secretary to look into the issue of telephone tapping, saying he seemed to be more concerned about the leakage than the credibility of his government on the issue of corruption. Advani remarked at an NDA press conference in New Delhi that Prime Minister Manomohan Singh is worried about the leakage. He added that the common man's concern is about the credibility of the government. There should be concern about this but that is not there.Advani was referring to Prime Minister asking Cabinet Secretary K M Chandrasekhar earlier in the day to look into the issue of telephone tapping.