LAS VEGAS — A Nevada man who was arrested over the weekend with guns at a security checkpoint outside a Donald Trump rally in the southern California desert has filed a lawsuit accusing the sheriff of falsely characterizing his arrest as a thwarted assassination attempt for his own personal gain.

The man, identified as 49-year-old Vem Miller of Las Vegas, had been driving an unregistered black SUV with a “homemade” license plate when he was stopped by deputies assigned to the rally in Coachella, east of Los Angeles, Riverside County Sheriff Chad Bianco said Sunday at a news conference.

Miller had a shotgun, loaded handgun, ammunition and several fake passports in his vehicle, Bianco said. Miller was released the same day on $5,000 bail.

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The lawsuit filed Tuesday in U.S. District Court in Nevada says Bianco lied about the fake passports, and that he “created a narrative so as to be viewed as a ‘heroic’ Sheriff who saved Presidential candidate Trump.” It names as defendants the sheriff, the Riverside County Sheriff’s Department and a sheriff’s deputy.

A call to the sheriff’s executive office for comment Wednesday was deferred to the department’s communications office, which did not respond to an email. The Associated Press also emailed Miller’s lawyer, Sigal Chattah, for comment.

Security is very tight at Trump rallies following two recent assassination attempts. Last month, a man was indicted on an attempted assassination charge after authorities said he staked out the former president for 12 hours and wrote of his desire to kill him. The Florida arrest came two months after Trump was shot and wounded in the ear during a campaign rally in Pennsylvania.

Bianco said that Miller also claimed to be a journalist, but that it was unclear if he had the proper credentials. Deputies noticed the interior of the vehicle was “in disarray” and a search uncovered the weapons and ammo, along with multiple passports and driver licenses with different names, Bianco said.

Miller’s lawsuit accuses the sheriff’s department of illegally searching the SUV. It also says that he willingly disclosed to officers at the checkpoint that he had weapons but intended to leave them in the vehicle.

Miller is scheduled to appear in court in January in the weapons case. He was arrested on suspicion of possessing a loaded firearm and possession of a high-capacity magazine, according to online records.