In 2012, three men on a late-night walk in Toronto discussed plans to conduct a major terrorist attack. Two of the men were al Qaeda-linked radicals. The third was an undercover FBI agent, secretly recording the conversation.

Their scheme: Drill a hole on the path of the Maple Leaf train traveling between Toronto and New York City, derail the passenger cars and kill as many civilians as possible.

An unprecedented level of cooperation between 15 U.S. and Canadian agencies halted the men in their tracks, thwarting an attack that would have killed up to 300 people.

Today, less than 100 days into the second Trump administration, the survival of Five Eyes — the U.S.-U.K.-Canada-Australia-New Zealand intelligence-sharing alliance crucial to stopping the Maple Leaf plot — has been thrown into question.

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This week’s revelation that The Atlantic Editor-in-Chief Jeffrey Goldberg was accidentally added to a Trump administration group chat discussing highly sensitive military information will........

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