Stock market today: Dow sinks 500 points, S&P 500, Nasdaq plummet as Trump threatens ‘massive increase’ on China tariffs Yahoo FinanceThe stock market is diving on Trump’s threat of more China tariffs. Is this a good time to buy? CNBCTrump threatens ‘massive’ China tariffs, sees ‘no reason’ to meet with Xi Fox NewsTrump threatens economic retaliation on China amid dispute over critical rare earths CNN