Donald Trump announced he signed the GOP loyalty pledge at a surreal press conference where Chris Hayes got to see Trump in action and ask the first question.Sept. 4, 2015
UP NEXT
'Every woman in every state is at risk': New Biden ad hits Trump on abortion
03:11
Court resumes in hush money trial: What to expect from Day 11
10:41
Undeterred by past Big Lie failures, Trump primes followers for poll confrontations
07:02
Trump trial casts light on dirty side of celebrity tabloids
06:01
'Cattle call': Trump faces limited options as VP hopefuls gather at Mar-a-Lago
06:06
'Pure evil': Robert De Niro unleashes on Donald Trump