Nikki Haley is sharpening contrasts with Donald Trump ahead of the South Carolina GOP primary on Saturday. Haley argues she is the lone remaining candidate who can unite Americans despite Trump's electoral wins so far. She criticizes Trump's comments about NATO allies at a recent rally, saying he "sided with a thug" in Putin. In a new ad, Haley argues she provided "moral clarity" as governor and is the only choice who can handle foreign disputes strongly. Haley has been campaigning on her experience as Trump's UN ambassador and says she would have acted differently than him.