Watch live: Joni Ernst, Theresa Greenfield in U.S. Senate debate

Iowa Republican incumbent Joni Ernst will debate Democratic challenger Theresa Greenfield on Thursday evening ahead of the Nov. 3 U.S. Senate election. 

The debate, scheduled for 6:30 p.m. Thursday, will be the third and final debate in that contest. The race, one of the tightest in the country, could help determine if Democrats can wrest control of the Senate from Republicans. Donors have poured in millions of dollars to each side, flooding the airwaves, internet and mailboxes with ads. 

A Des Moines Register/Mediacom Iowa Poll published last month showed Greenfield leading by 3 percentage points, which was within the margin of error. Other polls also have suggested the race is a toss-up. 

Follow live coverage of the debate at DesMoinesRegister.com. Check back for fact checks and analysis of the debate later Thursday and Friday.

Analysis:In a slew of competitive Senate races, Iowa’s draws second-highest advertising spending in the country

More:Joni Ernst has embraced President Donald Trump. Will that hurt her or help her as she runs for a second term?

The television partners for the “Commitment 2020: U.S. Senate Debate” are KCCI, Des Moines; KTIV, Sioux City; and KWWL, Waterloo. The debate also will air on DesMoinesRegister.com; KTTC, Mason City/Rochester; WGEM, Keokuk/Quincy; and WQAD, the Quad Cities.

KCCI’s Steve Karlin and Rheya Spigner will co-moderate with Brianne Pfannenstiel, chief politics reporter for the Des Moines Register; KTIV’s Matt Breen; and KWWL’s Ron Steele.

Previous Senate debate:Joni Ernst, Theresa Greenfield clash on Supreme Court, Social Security