In a video message posted at a social media website, the AAP MP from Sangrur accused Sukhbir Badal and other Shiromani Akali Dal (SAD) leaders of spreading false allegations against him.
"Punjab Deputy CM Sukhbir Singh Badal and your party leaders have been raising false allegations against me for which you don't even have any proof or medical report," Mann said in his message.
He challenged the minister and other party leaders to face dope test.
Mann added that the test reports thus be made public so that everyone knows who is a drug addict.
In a 'Sadbhavna rally' on November 23 in Bathinda, the SAD President had urged Delhi Chief Minister Arvind Kejriwal to ask his leaders to shun drugs, apparently referring to the AAP MP.