During a panel discussion featuring world leaders and philanthropists in Manhattan on Thursday afternoon, Alex Soros said the $23 billion philanthropic organization he leads would not cave to pressure from President Trump. Mr. Soros, the son of the billionaire investor and Democratic megadonor George Soros, defiantly told attendees that it had done nothing wrong and would back away from its human rights work “over my dead body,” according to two people who attended the panel who spoke on the condition of anonymity because it was an invitation-only event. The remarks came in response to a question about a report in...