If U.S. and Canadian intelligence services assess that Saudi Arabia deployed an assassination squad to Canada, the United States must respond. At the very least, Secretary of State Mike Pompeo should demand an explanation from Saudi Ambassador Reema Bandar al Saud.

I note this concern in light of the complaint filed in federal court on Thursday by former Saudi intelligence officer Saad al Jabri. As I reported in May, Jabri is an extraordinary ally of the U.S. and British intelligence services. During his government service, Jabri was instrumental to the successful infiltration of al Qaeda, helping save hundreds of innocent lives in the West.