Elon Musk, who is leading the Trump administration's effort to cut and streamline the federal government's workforce, visited the National Security Agency on Wednesday to meet with the NSA's head, a spokesperson for the agency told Reuters.

Wall Street thought the stock market would act as a check on the president. It's not panning out.

A 10% drop is a big enough deal that professional investors have a name for it — a “correction” — and the S&P 500’s 1.4% slide on Thursday sent the index to its first si