According to CPAC, Prime Minister Trudeau has invoke the Emergencies Act in relation to truck convoys against COVID-19 mandates.
Video link – https://www.cpac.ca/episode?id=5e1dee4a-a576-48f9-85b8-c2f620ddff61
Via Canada.ca
Emergencies Act
R.S.C., 1985, c. 22 (4th Supp.)
An Act to authorize the taking of special temporary measures to ensure safety and security during national emergencies and to amend other Acts in consequence thereof
More information on the emergency act here
https://laws-lois.justice.gc.ca/eng/acts/e-4.5/page-1.html