"He has been made a scapegoat. This is nothing but a whitewash by Delhi Police following strictures from the Supreme Court," said SP national spokesman and General Secretary Mohan Singh.
He said the Delhi Police should follow the apex court directives and find the source of the money which will be the clinching evidence in the case.
Asked whether the SP would raise the issue in Parliament, Mohan Singh said a decision in this regard would be taken tomorrow.
The party had expelled Amar Singh in Feb 2010 after he fell out with its leadership.