This week on "Face the Nation," former President Donald Trump faces yet another legal setback, and with the South Carolina Republican primary less than a week away, Nikki Haley is fighting for her home state. We'll hear from both of South Carolina's Republican senators — Tim Scott and Lindsey Graham — about their recent trip to the U.S.-Mexico border, and how the death of Putin critic Alexey Navalny will impact the push to aid Ukraine. Guests: GOP Sen. Lindsey Graham of South Carolina, GOP Sen. Tim Scott of South Carolina, CBS News legal analyst Rikki Klieman, Democratic Rep. Jim Clyburn of South Carolina, Historian Douglas Brinkley and reporter and author Amie Parnes