The Latest on President Donald Trump's plan to scale back national monuments (all times local): 5:55 p.m. Environmental groups are suing to block President Donald Trump's decision to scale back a national monument in Utah just hours after the decision was announced. The lawsuit filed Monday by Earthjustice on behalf of several groups challenges the reduction of Grand Staircase-Escalante National Monument, which has been a source of Republican frustration since it was created by Bill Clinton in 1996. Never miss a local story. Sign up today for a free 30 day free trial of unlimited digital access. SUBSCRIBE NOW The monument near the Arizona border contains a rich cache of dinosaur fossils and vast coal reserves. Trump said in Salt Lake City that Grand Staircase-Escalante National Monument will be reduced by half, from nearly 3,000 square miles (7,770 square kilometers) to 1,569 square miles (4,064 square kilometers). He also reduced Bears Ears National Monument in Utah. A coalition of American Indian tribes plans to sue over that decision. ___ 4:20 p.m. Native American leaders say President Donald Trump's move to shrink Utah's Bears Ears National Monument is another insult, one they're vowing to fight in court. Navajo Nation Vice President Jonathan Nez noted Monday that Trump's move comes a week after he referred to a Democratic senator he doesn't like as "Pocahontas." He says the administration doesn't respect indigenous people. Trump said in a speech Monday that many native people support the move. Nez called that event "a circus." Representatives from the five tribes who advocated for creation of the monument said Trump decided to reduce it without meeting with them, despite multiple requests. Zuni councilman Carleton Bowekaty called the move an illegal and shameful attack on tribes. Shaun Chapoose with the Ute Tribe says Trump's decision benefits "a few powerful Utah politicians." ___ 3:30 p.m. The Republican chairman of House Natural Resources Committee is applauding President Donald Trump for reversing what he called "abuses" of the Antiquities Act by former Democratic presidents. Rep. Rob Bishop of Utah says proclamations that Trump signed Monday shrinking