That meant that Trump, who won Georgia with about 40% of the vote in the primary, netted about 42 of Georgia's 76 delegates. Texas Sen. Ted Cruz won 18 and Florida Sen. Marco Rubio won the remaining 16.
The new changes only apply to presidential primaries scheduled after March 15; shortly after they were adopted, Secretary of State Brad Raffensperger set the primary for March 24.
Trump doesn’t face a serious threat from any of the Republican primary opponents who have announced campaigns: former Massachusetts Gov. Bill Weld and former U.S. Reps. Mark Sanford and Joe Walsh.
But even a hint of a rebellion in Charlotte from wavering delegates could be embarrassing for Trump, who has insisted on party loyalty and brags of high poll numbers among Republican voters.
The rule changes mean that even if a Republican rival to Trump gains traction, he or she would face a higher bar to earn seats on the convention floor or speaking slots. Other states have taken more expansive measures, including at least five that canceled their primaries.
Trump's advisers want to avoid a replay of what happened in 2016, when Cruz's supporters led an attempt to swipe his delegates. That effort failed, but added to a narrative of Republican disunity surrounding his campaign.
A senior Trump adviser said the campaign wants the Republican convention a “4-day television commercial” and not an internal feud.
“A properly executed convention is the single most important thing a campaign can do to put their candidate on the pathway to re-election,” the adviser said.