As polls open in Maine, a big question for the Dems is whether Graham Platner should be the party's nominee in November, even if he wins today's primary ... Donald Trump becomes the first sitting president to attend an NBA finals game, and the home team blows a 13-game winning streak. Coincidence? ... A private jet bursts into a massive fireball during an emergency crash landing. We bring you the latest on the investigation into what went wrong.