Anthony Fierro yells in front of a police officer as protesters are stopped from marching up State Street during President Donald Trump's announcement to eliminate vast portions of Utah's Bears Ears and Grand Staircase-Escalante national monuments in Salt Lake City, Utah, on Monday, Dec. 4, 2017. (Laura Seitz/The Deseret News via AP)

Anthony Fierro yells in front of a police officer as protesters are stopped from marching up State Street during President Donald Trump's announcement to eliminate vast portions of Utah's Bears Ears and Grand Staircase-Escalante national monuments in Salt Lake City, Utah, on Monday, Dec. 4, 2017. (Laura Seitz/The Deseret News via AP)

SALT LAKE CITY (AP) — President Donald Trump’s rare move to shrink two large national monuments in Utah triggered another round of outrage among Native American leaders who vowed to take the fight to court to preserve protections for land they consider sacred.

Environmental and conservation groups and a coalition of tribes began filing lawsuits Monday that ensure that Trump’s announcement is far from the final chapter in the yearslong battle over public lands. The court cases are likely to drag on for years, maybe even into a new presidency.

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Trump decided to reduce Bears Ears National Monument by about 85 percent and Grand Staircase-Escalante National Monument by nearly half. It earned him cheers from Republican leaders in Utah who lobbied him to undo protections by Democratic presidents that they considered overly broad.

Conservation groups called it the largest elimination of protected land in American history. The move comes a week after tribal leaders decried Trump’s use of the name of a historical Native American figure as a slur.

At a White House event honoring Navajo Code Talkers last week, he took a political jab at Sen. Elizabeth Warren by referring to the Massachusetts Democrat as “Pocahontas,” mocking her claim of having Native American heritage.

“It’s just another slap in the face for a lot of us, a lot of our Native American brothers and sisters,” Navajo Nation Vice President Jonathan Nez said. “To see that happen a week ago, with disparaging remarks, and now this.”

Trump also overrode tribal objections to approve the Dakota Access and Keystone XL oil pipelines.

The Navajo Nation was one of five tribes that formed a coalition and spent years lobbying former President Barack Obama to declare Bears Ears a monument to preserve ancient cliff dwellings and an estimated 100,000 archaeological sites. Native Americans visit the area to perform ceremonies, collect herbs and wood for medicinal and spiritual purposes, and do healing rituals.

The coalition of the Hopi, Ute Indian, Ute Mountain Ute, Zuni tribes and Navajo Nation sued late Monday to challenge the Bears Ears reduction. Two lawsuits have been filed to try to block the Grand Staircase decision.

Earthjustice’s suit called it an abuse of the president’s power that jeopardizes a “Dinosaur Shangri-la” full of fossils. Some of the dinosaur fossils sit on a plateau that is home to one of the country’s largest known coal reserves, which could now be open to mining. The organization is representing eight conservation groups.

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Another lawsuit from three groups including the Society of Vertebrate Paleontology makes similar claims.

Meanwhile, two Utah congressmen said Tuesday that they will introduce legislation to create a modest national park at Grand Staircase and allow Native Americans and local residents manage the land in Bears Ears.

Trump, in a speech at Utah’s Capitol with the governor and other politicians, said the state’s lands should not be managed by “very distant bureaucrats located in Washington.”

“Your timeless bond with the outdoors should not be replaced with the whims of regulators thousands and thousands of miles away,” Trump said. “I’ve come to Utah to take a very historic action to reverse federal overreach and restore the rights of this land to your citizens.”

It marks the first time in a half century that a president has undone these types of land protections.

Utah’s mostly Republican officials have lobbied Trump for months, saying the monuments closed off the areas to energy development and other access.

Environmental and tribal groups say the designations are needed to protect important archaeological and cultural resources. Navajo Nation Attorney General Ethel Branch said only Congress, not the president, has the power to reduce a national monument, which the tribal coalition argued in its lawsuit.

Additional legal challenges were expected from environmental groups and outdoor clothing company Patagonia.

Outside Trump’s announcement Monday, roughly 3,000 protesters lined up near the state Capitol. Some held signs that said, “Keep your tiny hands off our public lands,” and they chanted, “Lock him up!”

A smaller group gathered in support, including some who said they favor potential drilling or mining there that could create jobs. Bears Ears has no oil or gas, Interior Secretary Ryan Zinke told reporters, though Grand Staircase-Escalante has coal.

Bears Ears, created nearly a year ago, will be reduced to 315 square miles. Grand Staircase-Escalante will be reduced from nearly 3,000 square miles to 1,569 square miles.

Both were among a group of 27 monuments that Trump ordered Zinke to review this year.

Democrats and environmentalists accuse Trump and Zinke of engaging in a secretive process aimed at helping industry groups that have donated to Republican political campaigns.

Zinke accompanied Trump aboard Air Force One, as did Utah’s Republican U.S. Sens. Orrin Hatch and Mike Lee. Hatch and other state Republican leaders pushed Trump to launch the review, saying the monuments designated by the former Democratic presidents locked up too much federal land.

Trump framed the decision as returning power to the state, saying, “You know and love this land the best and you know the best how to take care of your land.” He said the decision would “give back your voice.”

“Public lands will once again be for public use,” Trump said to cheers.

Hatch, who introduced Trump, said that when “you talk, this president listens” and that Trump promised to help him with “federal overreach.”

No president has tried to eliminate a monument, but some have reduced or redrawn the boundaries on 18 occasions, according to the National Park Service. The most recent instance came in 1963, when President John F. Kennedy slightly downsized Bandelier National Monument in New Mexico.

Trump signed an executive order in April directing Zinke to review the protections, which Trump is able to upend under the 1906 Antiquities Act. The law gives presidents broad authority to declare federal lands as monuments and restrict their use.

Zinke has also recommended to Trump that Nevada’s Gold Butte and Oregon’s Cascade-Siskiyou monuments be reduced, though details are unclear. His plan would allow logging at a newly designated monument in Maine and more grazing, hunting and fishing at two sites in New Mexico.

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Associated Press writers Catherine Lucey in Salt Lake City and Darlene Superville in Washington contributed to this report.