If Donald TrumpDonald John TrumpBiden to nominate Linda Thomas-Greenfield for UN ambassador: reports Scranton dedicates 'Joe Biden Way' to honor president-elect Kasich: Republicans 'either in complete lockstep' or 'afraid' of Trump MORE wins the swing state of Michigan Tuesday, he'll win the presidency, Republican National Convention (RNC) Chairman Reince Priebus said Sunday. 

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"It's an absolute toss-up," Priebus said on ABC's "This Week." 

"When you look at Michigan, where jobs have gone to Mexico and China, people are out of work and people want things to get better, I think Donald Trump is offering that vision for the state of Michigan. If we win a state like Michigan ... it's all over." 

A RealClearPolitics polling average gives Democratic presidential nominee Hillary ClintonHillary Diane Rodham ClintonBiden to name longtime aide Blinken as secretary of State: report Understanding mixed results in Pennsylvania key to future elections What's behind the divisions over Biden's secretary of Labor? MORE a 5-point advantage in Michigan, 48 percent to 43 percent. 

Priebus also said Trump, the Republican nominee, hasn't "turned away" from Wisconsin, even though he canceled a campaign event there to go to Minnesota. 

"It's possible he may go back to Wisconsin tomorrow," he said. 

With just a few days until Election Day, Priebus said he thinks momentum will carry Trump across the finish line. 

"I don't think we're fighting from behind. We've got momentum," he said. 

"There's no question that over the last week and a half, Donald Trump has had an enormous amount of momentum. It's helping his chances and helping all of those senators out there that are running."