As DeSantis and Haley face off in Iowa GOP debate, urgency could spark fireworks

Just two Republican presidential candidates, former U.N. Ambassador Nikki Haley and Florida Gov. Ron DeSantis, will meet on the debate stage Wednesday night. With just five days before the Iowa caucuses, the debate may be their last, best chance to change the trajectory of the race before voting begins.

The big front-runner, Donald Trump, was the only other candidate to meet the 10% polling threshold to participate. But as he has six times before, the Republican former president is declining to show up given his overwhelming lead in the polls.

Here's what we're watching heading into the 9 p.m. EST event that will be hosted by CNN:

ONE ON ONE