Leaders from over a dozen opposition parties came together Saturday, vowing at a mega rally in Kolkata to put up a united fight in the coming Lok Sabha elections and oust Prime Minister Narendra Modi from power. Claiming that BJP's days at the Centre are numbered, TMC supremo and West Bengal chief minister Mamata Banerjee told the mammoth gathering that the "expiry date of the Modi government is over". Listen-in. (Text: PTI)