Ahead of government formation in Manipur, Union Ministers Nirmala Sitharaman and Kiren Rijiju left for Imphal on March 20. The leaders will attend the meeting as the BJP’s central observers. Caretaker Chief Minister N Biren Singh and BJP leader Biswajit Singh are camping in Delhi to discuss government formation with the party's top brass. Legislative party meeting of BJP Manipur likely to be held later today.