Authorities in the southwestern United States are seeking a man accused of making threats against former president Donald Trump.

Ronald Syvrud, of Arizona, threatened to kill Trump in multiple social media posts over the past couple of weeks, according to Cochise County public information officer Carol Capas. Capas declined to name which platform the threats were made on.

Trump is in Cochise County delivering remarks at the United States-Mexico border. The former president’s team was briefed by law enforcement about the search for the man before he arrived at the border, a source told CNN.

Ronald Syvrud is being sought by authorities in Arizona over making online threats against Donald Trump. (Cochise County Sheriff via CNN Newsource) (Supplied)

US Secret Service spokesperson Alexandria Worley said the agency is investigating the man.

“The US Secret Service investigates all threats against our protectees. As this is an ongoing investigation, we cannot comment further at this time,” Worley said.

The 66-year-old is wanted on several outstanding warrants stemming from drink-driving charges, felony hit and run, and failing to register as a sex offender, a release from the Cochise County Sheriff’s Office Facebook page said.

Trump meets with former UK prime minister after attempted assassination

Syvrud is a resident of Benson, Arizona, the release said, a city about 90km southeast of Tucson.

It is unclear if Syvrud is still in Cochise County and the sheriff’s office is asking for the public’s help in locating him.

Republican presidential nominee former President Donald Trump and Paul Perez, president of the National Border Patrol Council, at the southern border with Mexico,in Sierra Vista, Arizona. (AP Photo/Evan Vucci) (AP)

When asked about the man who allegedly made threats against him during his speech at the border, Trump said he was unaware the Secret Service was investigating the man but was “not that surprised.”

“I’ve heard it’s dangerous, but I also have a job to do… I haven’t heard about that. They probably want to keep it from me,” Trump said. “I have heard it was very unsafe to make this trip, there were some people that really didn’t want me to make it.”

The Secret Service started bolstering Trump’s security detail and planned to surround the former president with bulletproof glass at campaign rallies after an assassination attempt on Trump at his rally last month in Butler, Pennsylvania.

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