Incumbent Republican U.S. Sen. John Cornyn, seeking a fourth term, will face Democrat M.J. Hegar in November.
Hegar, an Air Force Veteran, will try to become the first Democrat elected to statewide office in Texas in more than a quarter-century.
Meanwhile, recent polls give former Vice President Joe Biden a slight edge over President Trump in Texas.
Can Democrats chip away at Texas' longtime red wall this fall?
KRLD's Chris Sommer talked about the important upcoming races with University of Houston political science professor Brandon Rottinghaus.