TODAY 8a: Candidates spar at GOP debate. New hope for back pain? One-on-one with comedian Matt Rife. What to shop this week.

<p>Highlights from the third Republican Presidential debate with the frontrunner, Donald Trump, not attending. Also, Your health: An inside look at a new form of chronic pain treatment that is drug free. Plus, comedian Matt Rife makes a stop on his comedy tour to join TODAY live ahead of the release of his Netflix special “Matt Rife: Natural Selection.” And, style expert Jasmine Snow with some trendy fall fashion looks to shop this week. </p>