President Barack Obama addressed supportive crowds in Cincinnati and Columbus on Monday.
In German Village, Obama attacked Mitt Romney about outsourcing jobs from the private sector to China.
His remarks come on the day that a new poll shows Ohio voters favor Romney over Obama when it comes to getting tough on China's trade practices.
Obama said when it comes to unfair Chinese auto subsidies, he's fighting back.
The President announced a new challenge with the World Trade Organization while campaigning on Ohio, saying the subsidies have cost thousands of jobs at auto and auto parts companies.
"It's not right, it's against the rules and we will not let it stand," Obama said.
The move comes after Romney ramped up charges that Obama lets the Chinese get away with widespread trade cheating.
Obama said that on trade, you have to "walk the walk, not just talk the talk."
Romney said the president is too late to the China issue and called his remarks a simple campaign ploy.
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