China seems to have arrested two Canadians as retaliation for Canada's arrest of a Huawei executive. To defend itself, the US and Canada must cite their independent judiciaries and rule of law.

We cannot argue that the US would never twist the law for political reasons. The bully has done precisely that to keep refugees in prison. We cannot take for granted that the two Canadians did not commit some real crime. But we do know that they won't get justice in their trials in China.

Working against the US, in this dispute about which country respects justice, will be the existence of imprisonment without trial in Guantanamo.