FILE - In this May 9, 2017, file photo, Interior Secretary Ryan Zinke rides a horse in the new Bears Ears National Monument near Blanding, Utah. Native American tribes and environmental groups preparing a legal battle to stop President Donald Trump from dismantling Utah's new national monument will face a tougher challenge than anticipated. Zinke has recommended Trump shrink Bears Ears, something past presidents have done 18 times to other monuments. (Scott G Winterton/The Deseret News via AP, File)
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