A former Nikki Haley admirer expressed disgust for her endorsement of Donald Trump after calling him out as unfit for office. The former South Carolina governor described Trump as “unstable” and “unhinged” on the campaign trail during her Republican presidential primary campaign, but she announced Wednesday she would be voting for him because she preferred his policies on immigration and foreign policy, and Republican strategist Sarah Longwell told CNN she was embarrassed for her. “This is just so disappointing,” Longwell said, “and here’s the thing: Nikki Haley didn’t just talk about Donald T…