COLUMBUS—Allies who commonly support the Obama Administration offered sharp criticism of an upcoming trade plan at a town hall meeting Wednesday night, insisting it could cost American workers jobs and undermine Wall Street and environmental reforms.

The two-hour meeting featured a half-dozen speakers who each advised Congress not to support the Trans-Pacific Partnership (TPP) trade agreement, a complex treaty to govern international trade among the United States and a dozen other nations. As a group, these nations control more than 40 percent of global trade.

“Ohioans would be well served to look at the catastrophic results of recent such arrangements,’’ […]