AP Decision Notes: What to expect in North Dakota's GOP caucuses

WASHINGTON (AP) — North Dakota will hold its Republican presidential caucuses on Monday, the last chance for Donald Trump’s rivals for the GOP nomination to slow his momentum heading into Super Tuesday, the biggest day of the primary campaign, when 15 states hold contests.

Trump’s main opponent in North Dakota once again will be Nikki Haley, who has yet to score a victory in her bid to take on Democratic President Joe Biden in the November general election.

North Dakota's caucuses function more like a party-run primary than the old Iowa-style of caucuses where voters move around the room to form groups. In North Dakota, people may show up at any time during caucus hours, cast a secret ballot and leave once they have voted.