Mr Rahul Gandhi along with a lady friend was arrested in America for possessing over 100,000 $ of unaccounted money and spend a night in US jail. Mr Natwar Singh approached Mr Brajesh Mishra, then National Security Advisor to NDA for help. Mr Mishra contacted american authorities who sought a personal request from A.B.Vajpayee, the then PM. Mr Vajpayee oblige, securing thereby Mr Rahul Gandhi's release.
This sounds like a bunch of baloney. I think it would have easily made the news were it true, the Indian television & print media air and publish almost all events in the lives of celebrities & public figures comprehensively. After some searching, I found the "source" of this: http://www.thestatesman.net/page.arcview.php?clid=3&id=163364&usrsess=1 It's a SPECULATIVE paragraph from the editorial column of a Calcutta newspaper :