US voters vote today in the midterm elections, which will decide whether Republicans retain control of the House and Senate. A Democratic victory in either chamber would significantly constrain Trump’s ability to advance his domestic agenda. Even if Republicans retain one or both chambers, a reduced majority could make passing legislation more difficult, and could pave the way for Democrats to launch investigations into the administration.

US midterm elections 2026 live: Americans go to the polls to decide control of Congress

What are the races to watch in the US midterm elections and why do they matter?