President Donald Trump's latest threat to China on Friday battered the stock market. Yet, Wall Street is left wondering if his warnings have teeth. Trump said in a Truth Social post that China was holding rare earth resources "captive" and raised the prospect of a "massive" tariff hike after the Asian country expanded export regulations. He was set to meet with Chinese leader Xi Jinping in two weeks in South Korea, but Trump said there was "no reason to do so" now. The Dow Jones Industrial Average tumbled more than 870 points after Trump's post. The S & P 500 dropped around 2.7%, snapping a 33-day streak without a move of at least 1% in either direction. .SPX 1D mountain S & P 500, 1-day U.S.-listed shares of Chinese-based companies and ETFs tracking them plunged, with the iShares MSCI Chi

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