Lawrence: Trump says he's too busy to explain his Iran war. A Democrat did it in five minutes.

Tonight on The Last Word: Democrats and some Republicans push back against Donald Trump’s ballroom and $1.776 fund. And the U.S. Senate campaign in Georgia advances to a run-off for Republicans looking to face Democrat incumbent Sen. Jon Ossoff. Sen. Cory Booker, Rep. Jamie Raskin, and Sen. Jon Ossoff join Lawrence O’Donnell.