FILE- In this June 19, 2007, file photo, tourists view rock formations formed over thousands of years in Boyden Cavern in Kings Canyon at Giants Sequoia National Monument, Calif. President Donald Trump's call to review 24 national monuments established by three former presidents puts in limbo protections on large swaths of land home to ancient cliff dwellings, towering Sequoias, deep, canyons and oceans habitats where seals, whales and sea turtles roam. (Mark Crosse/Fresno Bee, File)
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