To understand how this could happen, consider the following scenario. Suppose some allies withdraw support to the NDA government. Further suppose that the NDA government cannot manage the numbers game and eventually loses its majority in Parliament. Suppose that the Opposition parties fail to reach agreement on who should lead a new government. Suppose that before the presidential polls can be held, Parliament is dissolved. In June, the candidates for the next presidential poll will have to file nominations. Suppose that the Lok Sabha elections are timed to precede the President's election.