Former US president Donald Trump will remain on the Republican primary ballot in all states after today's historic Supreme Court ruling.

State courts in Colorado, Maine and Illinois moved to take Trump off the ballots, claiming he's ineligible for office after the 2021 Capitol riots.

But the Supreme Court has unanimously decided it's not within State power to ban him from the ballot.

Former George W Bush advisor Scott Jennings says Trump isn't done with the Supreme Court yet.

"They have to rule on whether he has absolute immunity from criminal prosecution- I have a sneaking suspicion he won't be as happy with them when that one comes out later this year."

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