A candidate for Delegate or Alternate Delegate must be a registered Republican in the District of Columbia since at least 4 June 2022 (two years prior to the primary).

Friday 1 March - Sunday 3 March 2024: District of Columbia Party-run Primary. Hours 8:00a-7:00p EST (1300-0000 UTC). Delegate Selection: Proportional Primary. Voter Eligibility: Closed Primary.

Party-run Primary
Status: Unofficial. Retrieved: Sunday 3 March 2024.
Included in Nationwide vote.

All of 19 of the District of Columbia's National Convention delegates are pledged to presidential contenders based on voting in today's District of Columbia Presidential Primary. [Republican Presidential Convention and Delegate Selection Plan Section II. 1]

• If a candidate receives in excess of 50% of the district-wide vote, that candidate receives 19 at-large delegates [Section V. 3.].
• Otherwise, the 19 at-large National Convention delegates are to be proportionally bound to those presidential contenders receiving 15% or more of the district-wide vote. If no candidate reaches 15%, the threshold is lowered to 10%. If no candidate reaches 10%, there is no threshold [RRP Rule 16(C)(2) and (3). Section V. 2.].
• Beginning with the candidate who received the most votes, round up fractional remainders to the next whole number. Continue until all delegates have been allocated.

Party-run Primary
Status: Unofficial. Retrieved: Sunday 3 March 2024.

Haley, having received in excees of 50% of the statewide vote, wins all 19 delegates.

The DC Delegation ... shall be bound through the first ballot ....

The 3 party leaders, the National Committeeman, the National Committeewoman, and the chairman of the CD Republican Party, will by virtue of their position, attend the Republican National Convention bound to the candidate of their choice. [Section V. 6.]

Friday 8 March - Friday 5 April 2024 (presumably): District of Columbia State Executive Committee Meeting.

The Republican State Executive Committee Meeting chooses the delegates from a list of names submitted by each presidential campaign.

A June primary vote for the Presidential nominee would have violated nation Republican Party Rule 16(c)(1) - prohibit primaries to elect, select, allocate, or bind delegates to the national convention from occurring after the second Saturday in June or less than forty-five days before the national convention is scheduled to begin, whichever is earlier.