Michael Bloomberg, mayor of New York City, leaves the Republican Party and registers as an independent.
Mayor Michael R. Bloomberg of New York, a former Democrat, is changing his affiliation to independent.
- New York Times
- Republicans raise concern about U.S. President Donald Trump's plan to impose tariffs on metal imports. Speaker of the House Paul Ryan says he is "extremely worried" about the impact of a trade war, adding that it could "undermine economic gains".
- Republicans on the House Intelligence Committee announce the end of their Russia investigation, against the objections of Democratic members. According to the investigation's preliminary findings, the 2016 Trump campaign did not collude with the Russian government, and, contrary to the U.S. intelligence community's previous conclusions, Russia did not have a preference for Donald Trump as a presidential candidate.
- A drawing is held to resolve a tied election between Democrat Shelly Simonds and Republican David Yancey, with Yancey being randomly chosen as the winner.
- An Amtrak train carrying Republican lawmakers to a retreat in West Virginia collides with a garbage truck in Crozet, Virginia. At least one person dies and one person is seriously injured. The White House states that there are no serious injuries among members of Congress or their staff.
- Two new Democratic senators—Doug Jones of Alabama and Tina Smith of Minnesota—are sworn in, bringing the Republican majority down to 51–49.