Is Elon Musk a national security risk? According to numerous interviews and remarks, Mr. Musk’s Department of Government Efficiency co-leader, Vivek Ramaswamy, once appeared to believe he was. In May 2023, Mr. Ramaswamy went so far as to publicly state, “I have no reason to think Elon won’t jump like a circus monkey when Xi Jinping calls in the hour of need,” a reference to China’s leader. In a separate X post targeting Mr. Musk, he wrote, “the U.S. needs leaders who aren’t in China’s pocket.”