GENEVA, Ohio - With 12 days to go until the election, Donald Trump spent Thursday sweeping across Ohio, making his final of three stops at the SPIRE Institute in nearby Ashtabula County. 

"In 12 days, we are going to win Ohio and we are going to win back the White House, believe me," Trump told an estimated crowd of 7,000-10,000 people.

Trump doubled down on ways he's better than Hillary Clinton, launching a new attack on the Democratic nominee's plans to fight ISIS. Trump claims Clinton wants to fight a war with a nuclear-armed Russia.

"Which could very well lead to World War III," said Trump. "I honestly think she's unstable. If you look at what she's saying, I honestly believe she's unstable."

The billionaire, backing up his economic plan by calling for a new trade deals, telling Ohio voters they have lost 1 in 4 manufacturing jobs since the North American Free Trade Agreement (NAFTA) was passed by former President Bill Clinton; and that if Trump can't rewrite it, he'll start from scratch. 

"We are living through the single greatest jobs theft in the history of the world," Trump said of the deal.

On healthcare, Trump said a full overhaul of the Affordable Care Act, or Obamacare, is necessary.

"Real change begins with repealing and replacing Obamacare," said Trump, citing recent premium price hikes announced by the Obama administration.

Trump also made history during his time in Geneva. His stop, the first by a presidential nominee since John F. Kennedy in 1960. Trump also needs these voters. Ashtabula County has not voted for a Republican since Ronald Reagan.

"Who has voted? Who's voted?" he asked the crowd, with hands shooting in the air as Trump discussed early voting.

More than 7 million voters have already cast ballots across the country; and good news for Trump: new numbers show more Republicans than Democrats have voted early in Ohio, including 17 percent fewer absentee ballot requests were received in traditionally-Democratic Cuyahoga County compared to 2012.

Trump also leads over Clinton in Ohio by four points in a Remington Research poll released this week.

But Trump is still trailing nationally by 5.4 points in the latest RealClearPolitics.com average of polls in a four-way race with third-party candidates Gary Johnson (L) and Jill Stein (G). Now he just needs to his supporters, turn out on election day. 

"He has a decisiveness that's sorely been lacking in many recent candidates. Number two, I like his economic policies," said Anthony Fix, of Ashtabula.

"Our country needs a change," said Tammy Kidwell, of Eastlake, Ohio. "I think he can make that happen."