The survey released Thursday shows O’Rourke with support from 52 percent of registered voters, compared with Trump’s 42 percent. Two percent of voters said they wouldn’t support either candidate and 4 percent said they had no opinion.

O’Rourke held the widest lead over Trump among other Democratic presidential candidates who were included in the potential matchup.

Sen. Bernie Sanders (I-Vt.) and former Vice President Joe Biden (D) tied for second place behind O’Rourke, with each leading Trump by 6 points.

Sen. Kamala Harris (D-Calif.) followed with a 4-point lead over Trump, while South Bend, Ind., Mayor Pete Buttigieg (D) led the president by 3 points.