Twenty-second Amendment to the United States Constitution
The Twenty-second Amendment (Amendment XXII) to the United States Constitution sets a limit on the number of times an individual is eligible for election to the office of President of the United States, and also sets additional eligibility conditions for presidents who succeed to the unexpired terms of their predecessors.
President's rule
In practice, president's rule has been imposed under different circumstances:If approved by both houses, President's Rule can continue for 6 months. It can be extended for a maximum of 3 years with the approval of the Parliament done every 6 months. If the Lok Sabha is dissolved during this time, the rule is valid for 30 days from the first sitting of the Lok Sabha provided that this continuance has already been approved by Rajya Sabha. The 44th Amendment Act of 1978 introduced a new provision to put a restraint on the power of the Parliament to extend President's rule in a state. According to this provision, President's rule can only be extended over a year every 6 months under following conditions:
President's rule can be revoked at any time by the President and does not need the Parliament's approval.