Columbia has imposed an additional 4.86% tariff on U.S. milk powder exports. The Columbian government claims the tariffs are necessary to offset unfair U.S. trade practices. The dispute centers on U.S. federal agriculture program funding that benefits American producers at the expense of Columbians.

There were no previous objections to the U.S. agriculture programs when the two nations signed a free trade agreement in 2012. Colombian producers brought up a case three years ago before the nation’s Ministry of Trade that claimed subsidies gave U.S. producers an unfair advantage. Those claims were dismissed.

The U.S. Dairy Export Council and the National Milk Producers Federation have asked lawmakers to step in.

Dairy products have not been the only targets of trade objections. Columbia has also initiated a case against U.S. ethanol exports and imposed bans on some American beef and poultry products.

Read more on Columbian tariffs on U.S. milk powder exports here.