BJP today slammed Congress over alleged involvement of its leaders in corruption cases and questioned former Finance Minister P Chidambram's role in 2G scam raking up recent ED raids at firms linked to his son. <br/><br/>Talking to media in New Delhi, party leader and Union Minister Nirmala Sitharaman also raised the issue of alleged corruption charges against Chief Ministers of Kerala, Himachal Pradesh and Uttarakhand and demanded that Congress should take action against them. <br/><br/>Citing a recent reported notification by the Swiss government, Ms. Sitharaman said it had reinforced the charge against former Union Minister Praneet Kaur that she had an undisclosed bank account in Switzerland.