By dominating the supply of multiple components critical to the fortunes of Tesla, the Chinese government holds so much leverage over chief executive Elon Musk’s wealth that his planned acquisition of Twitter should concern national security leaders, a dozen current and former officials involved in reviewing foreign investments told The Washington Post. While Musk has said he would have Twitter permit an even wider range of discourse than it does today, the ability of Chinese leaders to affect Musk’s fortunes could embolden them to ask that he identify opposition and American Twitter users, block content the government considers illegal, or...