St. Lucie County Judge Lauren Sweet denied bond on Saturday to illegal immigrant trucker Harjinder Singh, who is accused of causing a crash on the Florida Turnpike that killed three people.

Singh is charged with three counts of vehicular homicide and three counts of vehicular manslaughter. He has been appointed a public defender.

Last week, Singh was arrested in Stockton, California, and extradited back to Florida.

The case prompted U.S. Secretary of State Marco Rubio to halt the issuance of worker visas for commercial truck drivers on Thursday, pending a review of screening protocols.