Possible shutdown of Line 5 not a threat to Canada's energy security: ambassador Canada’s ambassador to the United States says that while the possible shutdown of Line 5 is a serious issue, it is not a threat to Canada’s national energy security. Social Sharing Enbridge VP Mike Fernandez says he's confident crude will continue to flow after May 12 deadline Posted: May 06, 2021 8:17 PM ET | Last Updated: May 7 Fresh nuts, bolts and fittings are ready to be added to the east leg of the Line 5 pipeline near St. Ignace, Mich.(Dale G Young/The Detroit News/The Associated Press)