Democrat Beto O'Rourke speaks Thursday during a rally in San Antonio.

Credit: Michael Karlis Beto O'Rourke, founder of well-funded voter-registration group Powered by People, warned during a Thursday event in San Antonio that President Trump may use U.S. Immigration and Customs Enforcement (ICE) agents to intimidate voters during November's midterms.

The alarm from O'Rourke - a former Democratic presidential, gubernatorial and U.S. Senate candidate - follows the state of Texas moving 1. 2 million registered voters to its "suspense" list, meaning they need to update their registrations by Oct. 5 if they want to participate in the upcoming election.