Art.356 of the Constitution provides:
1) The President can impose President's Rule in any State on receipt of a Governor's report about failure of Constitutional machinery in State,
2) Or, even without any report of Governor, the President can exercise such power on his own information.
3) The period of President Rule Can be maximum up to 3 Years. Art 356(4) Proviso.
4) During such period, President can direct the Governor to exercise all function of State Government
5) Or, President can even declare that, instead of the Governor, the Parliament shall exercise all the functions of that State Government.... Art.356(1)(b)
6) The powers of High Courts shall not be affected by such Rule.
For more details, plz see Art.356 of Constitution of India.
Haresh Raichura
10/6/2014