According to the US Supreme Court, a US president cannot be prosecuted for crimes (if they’re related to their official duties, but whatever goes, I guess). This means that Canada is faced with the fact that they’re being attacked by a foreign power with a ruler not beholden to the rule of law. If they give in, they’re going to be conquered by a king who is not bound by a national constitution, legislative body, nor courts. This is an existential threat to their freedom as individuals with rights.