A state of emergency in India refers to a period of governance under an altered constitutional setup that can be proclaimed by the President of India, when he/she perceives grave threats to the nation from internal and external sources or from financial situations of crisis. Under the advice of the cabinet of ministers and using the powers vested in him/her largely by Part XVIII of the Constitution of India, the President can overrule many provisions of the constitution, which guarantee fundamental rights to the citizens of India and acts governing devolution of powers to the states which form the federation. In the history of independent India, there were three periods during which a state of emergency was deemed to have existed.