President Trump threatened to impose additional tariffs on Chinese goods unless China rescinded its retaliatory tariffs, signaling his commitment to the trade war. Stock markets reacted with volatility, with the S&P 500 falling and then briefly rallying before ending the day down. Jamie Dimon, head of JPMorgan Chase, warned that stock prices might still be too high and that tariffs could increase inflation and slow the American economy. Governments have submitted proposals to lower tariffs, but Trump and his aides have offered conflicting signals on potential deals. In other news, Chief Justice John Roberts temporarily blocked an order to return a wrongly deported migrant to El Salvador, and Trump announced that the US would hold nuclear talks with Iran.