Welcome to Trail Guide, your daily tour through the wilds of the 2016 presidential campaign. It's Sunday, Sept. 6, and this is what we're watching:
- Conservative radio host Hugh Hewitt joins NBC's "Meet the Press" after a high-profile interview with Republican presidential frontrunner Donald Trump last week
- Carly Fiorina, the lone woman in the GOP presidential primary, joins CBS's "Face the Nation'
- Hillary Rodham Clinton on Saturday said she didn't 'stop and think' about her email setup