US President Donald Trump has urged Beijing to take “more aggressive action” to curb the export of drug precursor chemicals, noting to the US Congress that he had raised the issue “directly” with his Chinese counterpart. Trump’s call comes just days ahead of a planned summit with Chinese President Xi Jinping, and just a week after security agencies from the two countries praised progress in cooperation on counternarcotics law enforcement. The call was noted in an annual list sent to the US...