It appears the world's wealthiest person has set his mind to a new startup: his own political party.

As the ongoing public fracturing of the relationship between the US President Donald Trump and his top election financier continues to play out in public, Elon Musk has again vented his opposition to the so-called "Big Beautiful Bill," a tax and spending bill, which he believes undoes the efficiency mantra he sought to instill in Washington.

Musk has gone as far to warn Republican lawmakers who pass the bill that he'll run candidates against them in next year's primaries.

And he also threatened the broader US two-party system with the promise he'll form a faction of his own.

"If this insane spending bill passes, the America Party will be formed the next day," he wrote on X. "Our country needs an alternative to the Democrat-Republican uniparty so that the people actually have a VOICE."

A genuinely competitive third party would upend more than a century of Democrats-Republicans dominance at all levels of government.

Yet few have come close, despite dozens of minor parties operating across the US for decades.

The Libertarian Party, established in 1971, is the third biggest in America. Campaigning for free markets, small government and personal freedoms, it had its best........

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