Both sides claim overreach by the federal government. Five tribes and a dozen environmental organizations filed legal challenges almost immediately after President Donald Trump signed a proclamation that dramatically cuts back the area under protection for Bears Ears and Grand Staircase-Escalante national monuments. President Obama created Bears Ears National Monument a year ago. A coalition of tribes pushed for the action because of threats to sacred and culturally significant areas by mineral extraction, vandalism and looting. Trump’s action is a setback for tribes, but is it a violation of the century-old Antiquities Act that was created to stop plundering land important to Native Americans?