“Trump threatened to turn off Niagara Falls water unless Canada pays a tariff.”

The claim that Donald Trump threatened to turn off the water to Niagara Falls unless Canada pays a 100% tariff is false. This narrative emerged in September 2026, circulating primarily as a screenshot of a purported Truth Social post. Fact-checking organizations, including Snopes and other news outlets, conducted reviews of Trump's official social media activity and found no such post. Furthermore, there are no credible reports from any news organization or government source indicating that such a threat was made. The claim appears to be a piece of digital misinformation or satire that was presented as a genuine statement during a period of heightened trade tensions between the United States and Canada.