A total of 2,035 voters participated in the presidential primary, the party said.
Following the defeat, Trump dubbed the District of Columbia "the Swamp" with "very few delegates, and no upside."
"Birdbrain [Nikki Haley] spent all of her time, money and effort there. Over the weekend we won Missouri, Idaho, and Michigan - BIG NUMBERS - Complete destruction of a very weak opponent. The really big numbers will come on Super Tuesday," the former US president wrote on social media.
The US presidential election will be held on November 5. Incumbent US President Joe Biden announced his bid for reelection in April 2023 on the platform of the Democratic Party.