Worried about losing parts of Montana’s historic and ecological legacy, a grassroots group has sprung up to fight Trump administration attacks on the Upper Missouri River Breaks National Monument.

On Monday, Hold Our Ground, a campaign sponsored by the Montana Wilderness Association, was launched in Fort Benton, the gateway to the 146-mile float down the Wild and Scenic Missouri River. Three spokesmen detailed the different reasons they oppose efforts by the Trump administration to rescind or diminish the 378,000-acre Missouri River Breaks monument.