PALOMINO VALLEY, Nev. — President Trump’s budget proposal calls for saving $10 million next year by selling wild horses captured throughout the U.S. West without the requirement that buyers guarantee the animals won’t be resold for slaughter.

Wild-horse advocates say the change would gut nearly a half-century of protection for an icon of the American West and could send thousands of free-roaming mustangs to foreign slaughterhouses for processing as food.

They say the Trump administration is kowtowing to livestock interests who don’t want the region’s estimated 59,000 mustangs competing for precious forage across more than 40,000 square miles of rangeland in 10 states managed by the U.S. Bureau of Land Management.

The budget proposal marks the latest skirmish in the decades-old controversy pitting ranchers and rural communities against groups that want to protect the horses from Colorado to California.

“This is simply a way to placate a very well-funded and vocal livestock lobby,” Laura Leigh, president of the nonprofit protection group Wild Horse Education, said about the plan.

The National Cattlemen’s Beef Association and other interests have been urging the BLM for years to allow sales of wild horses for slaughter to free up room in overcrowded government corrals for the capture of more animals.

Doug Busselman, executive vice president of the Nevada Farm Bureau, blamed the stalemate on the “emotional and anti-management interests who have built their business models on preventing rational and responsible actions while enhancing their fundraising through misinformation.”