A constitutional amendment bill proposing simultaneous Lok Sabha and assembly elections is expected to be introduced in Parliament on Tuesday (December 17). As per reports, the Bharatiya Janata Party (BJP) has also issued a three-line whip to all its Lok Sabha MPs, directing them to be present in the House tomorrow. This comes after the Union Cabinet, chaired by Prime Minister Narendra Modi, passed the 'One Nation, One Election bill' on December 12.