Arvind Kejriwal, Yogi Adityanath indulge in late-night Twitter spat after PM's Parliament speech

Arvind Kejriwal's rebuttal of Prime Minister Narendra Modi's claim on migrants sparked off a furious Twitter exchange between him and Uttar Pradesh Chief Minister Yogi Adityanath on Monday evening, which led the Delhi Chief Minister to call his UP counterpart a "harsh and cruel ruler".