Trump, Biden make somber 9/11 appearances

The 2020 presidential race struck a somber note Friday, as President Trump and former Vice President Joe Biden observed the 19th anniversary of the September 11th attacks. Both candidates visited the Pennsylvania memorial to Flight 93 but did not cross paths there. Yamiche Alcindor reports, and Daniel Bush joins Judy Woodruff to discuss the campaigns and ongoing battles over mail-in ballots.