ABC News is apparently pressing the panic button in the wake of fierce criticism of its Sept. 10 presidential debate between former President Trump and Vice President Kamala Harris. A sworn statement by an ABC News whistleblower exposing network bias favoring Harris continues to be in focus regarding “assurances” to the Democrat’s campaign days before the event. Now David Muir, anchor of ABC’s “World News Tonight” and co-moderator of the debate, is defending his performance during the matchup, as ratings for his evening news broadcast have plunged some 12% in the aftermath. “ABC News has offered assurances to the Harris...