Welcome to Trail Guide, your daily tour through the wilds of the 2016 presidential campaign. It's Thursday, Sept. 3, and this is what we're watching:
- Republican Party officials want Donald Trump to promise not to launch an independent bid
- Trump is expected to comment on the GOP's loyalty pledge at a press conference
- Amid a roiling feud with Trump, Jeb Bush will hold a town hall in New Hampshire
- Bernie Sanders is opening a campaign office in Ottumwa, Iowa
Jeb Bush: 'Bizarre' for Trump to demand that I speak English
Jeb Bush says Donald Trump is "trying to insult his way to the presidency" and criticized Trump's comments about his bilingual campaigning as "hurtful" and "bizarre.