Tonight on The Last Word: Donald Trump Jr. testifies in the New York civil fraud trial. Also, a judge could delay Donald Trump's classified documents trial. Plus, Maine gun laws come under scrutiny after the mass shooting. And evacuations from Gaza at the Rafah Border Crossing begin. Adam Klasfeld, Tim O'Brien, Bradley Moss, Glenn Kirschner, Tennessee State Rep. Justin J. Pearson, Ellison Barber and Nicholas Kristof join Lawrence O'Donnell.