Trump Takes Aim at China in Victory Tour Stop

President-elect Donald Trump unloaded on China during the third stop on his "thank you" victory tour, telling a crowd in Des Moines, Iowa that the country is "going to start" playing by the rules.

Trump has taken a tough stance on China throughout his campaign, but he raised eyebrows as president-elect when he fielded a phone call from the Taiwanese president, a move that broke with decades of U.S. policy.

"They haven't played by the rules," Trump said. "And I know it is time that they are going to start."

Trump took aim at China, for among other things, product dumping, currency manipulation and the "massive theft of intellectual property."

"Other than that they have been wonderful," he added.

Ahead of the stop, Trump met with victims of the attack on the campus of Ohio State University last week, as well as 150 first responders to thank them for their service.

On Nov. 28, an 18-year-old OSU student, Abdul Razak Ali Artan, allegedly drove into pedestrians and began stabbing people, injuring 11 before he was fatally shot by a university police officer.

Trump reached out to the school and requested the meeting with the officer Alan Horujko -- whom he called "very brave" -- along with more first responders and victims, according to university official.

"We just saw the victims and the families" Trump told reporters briefly after the meetings. "These were really brave people, amazing people."

After the meetings on the university campus, Trump continued on to Des Moines, Iowa, for the next stop on his victory tour. In Iowa, he appeared with Gov. Terry Branstad, R-Iowa, his pick for ambassador to China.

Trump's visit to Ohio State University caught some students cramming for finals by surprise.

"I support it, even if I'm not a Donald Trump supporter," said Vince Wells, a senior studying political science.

Claire Whillans, a postgraduate student, said Trump's visit can help bring people together, even if she disagrees with his initial reaction to the attack.

Trump has claimed ISIS took credit for the attack and that the attacker, a refugee of Somali descent, shouldn't have been in the country. Artan was a legal permanent resident.

His tweets prompted one victim -- Ohio State University Professor Emeritus William Clark -- to turn down his invitation to the Trump meeting.

"I took a little exception to that," Clark, who was struck by Artan's car, said in a phone interview.

About the event, he added: " I wasn't convinced to who's benefit this would be."

Clark, who is still recovering from the attack but is walking unaided, said the meeting didn't feel "particularly necessary for me as part of the healing process."

ABC News' Arlette Saenz and Katherine Faulders contributed to this report.