Under North Dakota’s rules, candidates are eligible to win delegates if they finish with at least 20 per cent of the vote. However, a candidate who wins at least 60 per cent of the vote receives all of the state’s 29 delegates.
Four candidates were on the ballot, including Mr Trump and Ms Haley. The other candidates, who have received little attention, were Florida businessman David Stuckenberg and Texas businessman and pastor Ryan Binkley, who recently ended his campaign.
North Dakota Governor Doug Burgum, who ended his unsuccessful presidential campaign in December, was speaking on Mr Trump’s behalf on Monday night. He endorsed Mr Trump before the Iowa caucuses.
“I think we’re going to send a message that is going to be a kickoff to tomorrow, which is President Donald Trump is going to close this out, this is going to be the end of the trail, and we’re going to say we have a nominee, and let’s go after it, and beat Joe Biden in the fall,” Mr Burgum said in a virtual address.
Longtime Republican state senator Dick Dever said he voted for Ms Haley, but added she was unlikely to win.
The retired factory representative, 72, said: “I hear an awful lot of people say that they really liked Trump’s policies but they don’t like the way he conducts himself, and I think he’s gone overboard a bit.”