Tonight on The Last Word: Chief Justice Roberts claims the Supreme Court is adhering to the "highest standards of conduct." Also, Attorney General Merrick Garland publicly ignores the Trump letter. Plus, a Florida school bans Amanda Gorman's inauguration poem. And Uvalde families are demanding accountability one year later. Cecile Richards, Mini Timmaraju, Daniel Horwitz, Rep. Maxwell Alejandro Frost and Beto O'Rourke join Lawrence O'Donnell.