Final answer:
The international trial against a Canadian Prime Minister accused of violating international human rights laws would most likely be held at the International Criminal Court (ICC).
Step-by-step explanation:
If a new Canadian Prime Minister is reasonably accused of violating international human rights laws, the international trial against them would most likely be held at the International Criminal Court (ICC). The ICC, established by the United Nations, is a permanent court responsible for overseeing cases related to egregious human rights crimes and violations of international law. It is designed to bring perpetrators to justice and end impunity for such acts. Examples of cases that have been brought before the ICC include war crimes, genocide, and crimes against humanity.