Republican presidential candidate former President Donald Trump points to a reporter for a question as he speaks at his Mar-a-Lago estate, March 4, 2024, in Palm Beach, Fla. (PHOTO / AP)

Donald Trump won the North Dakota Republican presidential caucuses on Monday, according to a projection by Edison Research, ahead of a slew of contests known as Super Tuesday when he is expected to further strengthen his grip on the party's presidential nomination.

In North Dakota former president Trump easily defeated Nikki Haley, his last remaining rival for the Republican presidential nomination. Trump is expected to dominate Tuesday's elections, when 15 states and one US territory vote in the biggest day in the primary calendar.

On Monday, US Supreme Court unanimously ruled that Trump can remain on the primary ballot in Colorado, rejecting the state's disqualification and potentially setting national wide guidelines

Former UN ambassador Haley won her first nominating contest on Sunday, the Washington, DC, primary, but has no clear path to the nomination in a primary season where Trump has won the first eight contests and is expected to carry almost all the remaining races going forward.

Trump is focused on a likely general election rematch in November with US President Joe Biden, a Democrat.

On Monday, US Supreme Court unanimously ruled that Trump can remain on the primary ballot in Colorado, rejecting the state's disqualification and potentially setting national wide guidelines.

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The nine justices, three liberal and six conservative, all agreed with the ruling.

By deciding that states lack the authority to remove Trump from the ballot due to his involvement in the events preceding the Capitol riot on Jan 6, 2021, the Supreme Court delivered a significant victory to the former president, who is the frontrunner in the Republican presidential race.

The US Supreme Court declared that the Colorado Supreme Court had made an incorrect assumption that states possess the authority to decide whether a presidential candidate is disqualified under Section 3 of the 14th Amendment of the Constitution, which prohibits individuals who have engaged in insurrection from holding public office.

"Because the Constitution makes Congress, rather than the states, responsible for enforcing section 3 against all federal officeholders and candidates, we reverse," the ruling said.

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The latest ruling makes it clear that it is Congress, rather than individual states, that is responsible for establishing regulations regarding the enforcement of the 14th Amendment provision. Therefore, this decision applies to all US states, not just Colorado.

"BIG WIN FOR AMERICA!!!" Trump posted on his social media shortly after the Supreme Court's decision was released.

Colorado Secretary of State Jena Griswold expressed disappointment in the court's decision. "Colorado should be able to bar oath-breaking insurrections from our ballot," she said on X, formerly known as Twitter.