After record-high early voter turnout, Democrats hope Texas' primary election on Tuesday will show that anger over U.S. President Donald Trump's policies could help them flip congressional seats from Republican control in November.

Democrats need to gain 24 seats nationwide to retake the U.S. House of Representatives, a feat that would allow the party to block the Republican president's legislative agenda.

In the first U.S. primary of the 2018 midterm election season, Texas Democrats were fielding their largest contingent of congressional and legislative candidates in a primary in several decades, and were encouraged the strong early turnout was a sign of electoral success to come in the most populous Republican-held state.