Rivian Automotive Inc. (NASDAQ:RIVN) shares are trading higher on Monday. Canadian Prime Minister Justin Trudeau announced on Monday that Canada will join the U.S. and European Union to impose tariffs on importing Chinese electric vehicles. The Details: The Prime Minister said that beginning on October 1, Canada will impose a 100% tariff on Chinese-made EVs to curb a flood of cheaper imported EVs resulting from what he called China’s intentional, state-directed policy of over-capacity. “I think we all know that China is not playing by the same rules,” Trudeau told reporters Monday. “What is im…