The Fox News Decision Desk projected Sen. Rick Scott will win a second term in the Senate, defeating a former Democrat congresswoman who challenged him for the seat.

California’s election results will need to be certified before the winner can be sworn in, a spokesman for Senate Majority Leader Charles E. Schumer (D-N.Y.) said. Regardless of who wins, California ...

Democrats face long odds in the Senate and Republicans have already flipped a seat in West Virginia. The GOP needs to net just one more to control the chamber outright.