The European Parliament on Monday halted the ratification process of a sweeping trade deal with the United States, the latest fallout from the Supreme Court striking down most of President Donald Trump's tariffs. Following an emergency meeting in Brussels, lawmakers said the U.S.' side of the deal is now "so uncertain." "Nobody knows what will happen ... and it's unclear if there will be additional measures or how the United States will really guarantee" its end of the agreement, the parliament's trade committee chief Bernd Lange said. As the announcement was being made, Trump used social media to threaten "any country that wants to 'play games' with the ridiculous supreme court decision." Trump said countries could be hit "with a much higher tariff." Trump ended his Truth Social post with, "BUYER BEWARE!!!" The uncertainty coupled with Trump's threats sent U.S. stocks to their lows of the day. The Dow fell more than 710 points, or more than 1.4%. The S&P 500 fell 1% and the Nasdaq fell 1.3%.…