President Donald Trump announced Friday that his administration will allow more beef to be temporarily imported into the U.S. without triggering higher tariffs, which drew swift pushback from cattle producers and conservative rural-state Republicans.

Beef prices have climbed to record highs amid a drop in the number of U.S. cattle, consistent consumer demand and limits on cattle from Mexico, where the animals are facing a flesh-eating pest. The U.S. president has also imposed 50% tariffs on Brazil, a major beef exporter.

Trump remains under pressure to cut costs and address affordability issues ahead of November’s midterms. But ranchers, normally some of the president’s biggest supporters, are enjoying some rare profitable years and worry cheap beef imports will reduce cattle prices — and with it, the incentive to increase herd sizes.

“We all want lower grocery prices, but as I’ve said for months, we cannot do it at the expense of American producers,” Sen. Deb Fischer, R-Neb., said in a statement. “Flooding the market with foreign beef hurts our livestock industry and undermines the long-term solution: growing the U.S. cattle herd to meet demand.”

Sen. Tim Sheehy, R-Mont., said in a social media post just hours after Trump’s announcement that the president’s “heart is in the right place,” but importing beef will “harm our ranching families who feed the nation.”