I guess Nikki didn’t want to make a run for President in 2024.
It should also be noted that Nikki Haley is not constitutionally eligible to serve as President or VP: https://www.scribd.com/lists/22182725/Some-Politicians-Seeking-High-Office-Who-Are-Not-A-Natural-Born-Citizen-of-U-S ... and ... http://www.kerchner.com/protectourliberty/naturalborncitizen/TheWhoWhatWhenWhereWhyandHowofNBC-WhitePaper.pdf