Bollywood actor Anupam Kher says that playing Dr. Manmohan Singh has been the toughest role in his film career. Anupam Kher was speaking to Hindustan Times' Sandip Pal. The Accidental Prime Minister is based on the book of the same name by Sanjaya Baru, who served as then PM Manmohan Singh's media advisor between 2004 and 2008. “Dr. Manmohan Singh is not a very expressive person. You have never seen him laughing loudly. You have never seen him angry. His face is the same, whether he is expressing hurt, anger, disgust, pleasure or happiness. That means I had to internalise the whole thing,” says Kher. Watch the full interview for more details.