With just 15 days until Election Day, Mary Bruce reports from Wisconsin as Donald Trump and Kamala Harris crisscross the battleground states, and a new poll shows the race in seven battleground states all within the margin of error; Mireya Villarreal has the latest on the investigation after a private helicopter slammed into a radio tower in Houston, Texas, killing all four passengers on board, including a child; Faith Abubey reports on the new video showing the chaotic scene during a dock gangway collapse in Georgia that killed seven people; and more on tonight's broadcast of World News Tonight with David Muir.