Prime Minister Justin Trudeau has invoked the never-used Emergencies Act to give his government enhanced authority in response to the anti-vaccine mandate protests and blockades gripping Canada.
The law will grant Mr Trudeau's government extraordinary powers for 30 days - including the power to prohibit public assembly, travel and the use of specific property.
The move comes amid weeks of disruptive - and expensive - demonstrations against Covid-19 restrictions.
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The Emergencies Act, passed in 1988, bestows the government with added powers in times of national crisis.
The situation must meet a high bar, specifically an "urgent and critical situation" that "seriously endangers the lives, health or safety of Canadians".
And Cabinet may only invoke the legislation if the emergency cannot be addressed by any existing federal law and if it exceeds the capacity of the provinces to handle it effectively.
The Emergencies Act outlines four different types of emergencies: public welfare emergencies, public order emergencies, international emergencies and war emergencies. If the legislation is invoked this week, it will likely be under the 'public order' category. Again, the criteria here is strict - lawful protests do not qualify.
Instead, the situation must be considered a threat to the security of Canada, as defined by the Canadian Security Intelligence Service Act. This law outlines four possible scenarios:
* Espionage or sabotage
* Foreign-influenced activities
* Threats or use of acts of serious violence for political, religious or ideological objectives
* Covert, unlawful acts intended to undermine or overthrow the constitutionally established government
It is so far unclear which scenario Mr Trudeau would rely on to justify the use of the Emergency Act - none of these four scenarios have been clearly present in Ontario.
To invoke the law, the prime minister must also consult with the premiers of any impacted provinces before putting the move before Parliament. If the act does not pass a vote there, the proclamation will be revoked.