Meet Chase Oliver, the youthful Libertarian presidential nominee

Mr Oliver said Trump represents “the warfare state around the world” and criticised his expansion of the US national debt and the Covid lockdowns during his four-year term in office.

In the end, the Libertarian convention chair ruled that Trump, as the presumptive Republican nominee, was ineligible to be the Libertarian nominee.

The Republican former president wasn’t the only outsider to address the convention. Robert F Kennedy, who is currently organising an independent bid for president, also spoke – and his reception was significantly warmer.

When it was time for balloting, however, he only received support from only about 2% of the delegates and was eliminated in the first round.

In polls of the American public, however, Mr Kennedy has been doing significantly better than any third-party or independent candidate in decades, polling around 15% at his highest. That’s well above the 3% that was the high-water mark for Libertarian Party candidate Gary Johnson in 2016 election results.

Mr Oliver says he understands why Mr Kennedy, the nephew of US President John F Kennedy, would do well – but he told Americast that voters looking for an outsider are better served with his party, which is trying to build a lasting alternative to the two-party system.

Mr Kennedy, he warns, is a “one-and-done” option who won’t be around after this election.

“Do you want to cry out with a protest vote?” he asked. “Or do you want to build something that can last and build up a foundation so that we can tear down the abuses of the state together?”