The Congress and other opposition parties on Monday mounted pressure on Prime Minister Narendra Modi to sack Madhya Pradesh chief minister Shivraj Singh Chouhan following a series of deaths in the state recruitment board, or Vyapam, scandal. The opposition said Prime Minister Modi should break his silence on the chief minister, heading a BJP government for the third term, because “he was responsible for 45 deaths” so far in the Vyapam scam.