In Canada, authorities have arrested a top executive with the technology giant Huawei and are preparing to extradite her to the United States to stand trial. Chief financial officer Meng Wanzhou—who’s also the daughter of Huawei’s founder—was arrested in Vancouver on December 1. Both the Canadian Justice Department and the Trump administration have so far refused to say what she’s being charged with, although The New York Times reports the Treasury and Commerce Departments have subpoenaed the company over suspected violations of sanctions against Iran and North Korea. China’s government demanded Meng’s immediate release, saying the detention violated her human rights. Meng Wanzhou’s arrest came on the same day that President Trump met with Chinese President Xi Jinping in Argentina to discuss the growing U.S.-China trade war. On Tuesday, after Trump declared in a tweet, “I am a Tariff Man,” the U.S. stock market plummeted, with the Dow Jones dropping nearly 800 points.