Bihar Chief Minister Nitish Kumar called on Lalu Prasad, as the RJD supremo landed in his hometown after seven months, amid speculations that the two leaders will jointly work towards forging a country-wide opposition unity to take on the BJP in next year’s Lok Sabha polls. Kumar drove to the residence of Rabri Devi, former chief minister and wife of Prasad, late on Friday evening, hours after the RJD supremo arrived.