A state of emergency is a legal status granted to the government during a crisis. This type of declaration can give the President a significant amount of powers to deal with the situation. This may include imposing regulations that infringe on the rights enshrined in sections 4 and 5 of the Constitution (such as freedom of movement, secrecy of correspondence or limiting assembly), but only if he or she considers such infringements to be “reasonably necessary for the purpose of dealing with the situation that exists during that period.”
State of emergency typically applies to large-scale disasters and crises, where the traditional legislative paths through which a government functions may be slow in rendering aid. States of emergency may be imposed for a period of time and may involve curfews, rationing or rapidly mobilizing the National Guard.
The President can also declare a state of siege, which reduces civil liberties further and gives him or her the ability to search any property without a warrant, restricting freedom of movement even more than in a regular state of emergency. The President can also seize any assets he or she considers essential to the safety of the population and public order.
The Governor of a state may also have some additional powers during a state of emergency, but these will vary from state to state. A local or regional state of emergency can often be declared by a local council or other executive officers and may require legislative approval for it to be extended.