U.S. President Donald Trump on Friday railed against what he called tremendously high Canadian tariffs on dairy and lumber, and said his administration could soon impose reciprocal tariffs on Canadian products.

Tariffs on dairy products are expected to be put in place on April 2 to level out trade practices between the U.S. and Canada, but farmers and consumers are worried about what that will mean for their bottom line.

A potential increase on fertilizer and grain tariffs could deal a big blow to Maine’s dairy industry, according to the president of the Maine Dairy Association. The trade group's president says many Maine farmers rely on fertilizer and organic grain from Canada.