Congress President Sonia Gandhi slammed Opposition for targeting Prime Minister Manmohan Singh. She termed the act as “shameful” and asserted that the Prime Minister is ‘100 per cent above board” in the 2G spectrum issue.Coming out in defence of the Prime Minister, she reminded the BJP that it had to pay a price of trying to “destroy the image” of Dr Singh during last Lok Sabha elections and said it should draw “lesson” from that.Hitting back at BJP for seeking to corner the government over 2G spectrum scam, Mrs Gandhi attacked the Opposition party for retaining B S Yeddyurappa as Karnataka Chief Minister and compared this decision with the UPA action in making A Raja, Natwar Singh, Shashi Tharoor and Ashok Chavan resign from their posts in the wake of corruption charges.