President Trump posted a message on social media at 1 a.m. Sunday stating Canada seeks state-like benefits without equivalent obligations and criticizing Canadian tariffs on U.S. farmers. The United States then imposed 50% tariffs on $20 billion of Canadian imports, after which Canadian leaders ended negotiations and announced dollar-for-dollar retaliatory tariffs effective September 8. U.S. Trade Representative Jamieson Greer cited protection of American workers and supply chains as the rationale.