New Delhi, Jan 2 (ANI): Amitabh Bachchan has put the rumours to rest by tweeting that he is not involved in an advertisement campaign for Prime Minister Narendra Modi. The actor tweeted: The news by media that PM and PMO have asked me to be involved in a campaign film, is incorrect!! Kindly rectify... thank you!! Reports had suggested that the ad campaign was for promoting communal harmony in the country. Big B has been the face of the Gujarat tourism when Narendra Modi was the Chief Minister of the state. Mr. Bachchan has been the brand ambassador of many government campaigns, including polio eradication, saving the tiger and Swachh India campaign.