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.