Twenty-second Amendment to the United States Constitution
Some argue that the 22nd Amendment and 12th Amendment bar any two-term president from later serving as vice president as well as from succeeding to the presidency from any point in the presidential line of succession. Others contend that the original intent of the 12th Amendment concerns qualification for "service" (age, residence, and citizenship), while the 22nd Amendment, concerns qualifications for "election", and thus (strictly applying the text) a former two-term president is still eligible to "serve" as vice president (neither amendment restricts the number of times an individual can be elected to the vice presidency), and then succeed to the presidency to serve out the balance of the term (though prohibited from running for election to an additional term).
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.