In a letter on Thursday, the lawmakers urged deputy inspectors general at several federal agencies to investigate potential national security breaches involving Musk's team. Those agencies include the U.

House Democrats made an unsuccessful long-shot attempt Wednesday to subpoena billionaire Trump lieutenant Elon Musk to testify about his efforts to radically reshape the federal government. Why it matters: It's a stark demonstration of the strict limits on Democrats' power to serve as a check on the Trump administration as the minority party in Congress.