In what the former president has billed as his first major rally of the 2024 presidential race, Trump has called on supporters to assemble at an airport in Waco, Texas, and cheer on his bid for the Republican Party nomination.

Waco is marking the 30th anniversary of a raid by federal agents on the Branch Davidians religious sect there that resulted in 86 deaths, including four law-enforcement officers.

Some right-wing extremists view the raid as a seminal moment of government overreach.

In an email, a Trump campaign spokesman said Waco was chosen because it was situated between several major population centres and had the infrastructure to host a large event.

Trump faces growing legal peril from a series of ongoing criminal investigations, including one in Manhattan related to an alleged hush-money pay off to porn star Stormy Daniels during his 2016 White House campaign.

Trump has sought to paint the Manhattan case as politically motivated, raised money from it and used it to rally supporters to his side.

On Friday, he issued an apocalyptic warning, saying the country faced potential "death & destruction" if he was charged with a crime.

"Trump is walking on a high wire without a net, telegraphing that he has nothing to lose and is willing to risk dangerous outcomes to rally support," said Ron Bonjean, a Republican strategist in Washington.

Few supporters have heeded his calls to take to the streets to protest his possible indictment in the Manhattan case.

Those calls will likely invite closer than normal scrutiny of how many people attend Saturday's rally, where Trump, who is due to start speaking at 5pm CDT (2200 GMT), is expected to rail against the potential prosecutions.

The city of Waco said it was expecting 15,000 people to attend the rally.

In an editorial, the Houston Chronicle said the decision to host the event in Waco during the anniversary of the Waco siege represented far more than a dog-whistle message to far-right and conspiratorial Trump supporters.

"The more apt metaphor is the blaring air horn of a Mack 18-wheeler barrelling down I-10," the newspaper said, adding that Waco had become "a shrine for the Proud Boys, the Three Percenters, the Oath Keepers and other anti-government extremists and conspiracists".

Timothy Naftali, a presidential historian at New York University, said he would be watching to see if Trump explicitly references conspiracy theories related to the siege, similar to how he promoted lies about a stolen 2020 election in the run-up to his supporters' assault on the US Capitol on January 6, 2021.

"He still has the power to create more wreckage and his choice of venue allows him to do more damage if he wishes. We'll see," Naftali said.

In addition to prosecutors, Trump is likely to target Ron DeSantis for criticism.

The Florida governor has yet to declare his candidacy for the Republican nomination but has drawn Trump's ire nonetheless.

Australian Associated Press