Currency manipulation by countries including China, Singapore and Malaysia has left some small manufacturers across Ohio struggling to maintain healthy volume of exports, U.S. Sen. Sherrod Brown said Thursday.

As evidence, Brown cited a U.S. Department of Labor list of companies certified to receive Trade Adjustment Assistance for the business or its workers during the past two decades — including at least 20 north central Ohio businesses.

After figures in May showed a 34 percent jump in the U.S.-China trade deficit, Brown announced he will reintroduce the Currency Exchange Rate Oversight Reform Act of 2013.