In Florida, incumbent Senator Marco Rubio, who ran unsuccessfully for the Republican presidential nomination earlier this year, was declared the winner and re-elected to a second term.
In North Carolina, Republican Senator Richard Burr held only a 2 percentage point lead over his opponent, Deborah Ross, according to polling website RealClearPolitics.com.
Similarly close races seen as “toss-ups” were under way in Missouri, New Hampshire, Pennsylvania, Nevada and Indiana. Major TV networks said Republican Senator Rob Portman, who had refused to campaign with Trump, was re-elected in Ohio.
