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On Dec. 4, President Trump traveled to Utah to sign proclamations downsizing by 85 percent and by nearly 50 percent. “[S]ome people think that the natural resources of Utah should be controlled by a small handful of very distant bureaucrats located in Washington,” Trump . “And guess what? They’re wrong.”

 and have already filed lawsuits challenging Trump’s action. In as environmental and natural resources law scholars, the president’s action is illegal and will likely be overturned in court.

Contests over land use

Since 1906 the has given presidents the authority to set aside federal lands in order to protect “historic landmarks, historic and prehistoric structures, and other objects of historic or scientific interest.”

When a president creates a national monument, the area is “reserved” for the protection of sites and objects there, and may also be “withdrawn,” or exempted, from laws that would allow for mining, logging, or oil and gas development. Frequently, monument designations grandfather in existing uses of the land, but prohibit new activities such as mineral leases or mining claims.

In April President Trump of national monuments designated in the past two decades.

Because monument designations reorient land use away from resource extraction and toward conservation, some monuments have faced opposition from local officials and members of Congress. In the past two decades, Utah has been a flashpoint for this debate.

In 1996 President Clinton designated the , a region of incredible slot canyons and remote plateaus. Twenty years later, President Obama designated , an area of scenic rock formations and sites sacred to Native American tribes.

Utah’s and have long argued that these monuments are larger than necessary and that presidents should defer to the state about whether to use the Antiquities Act.

Zinke’s review

In April, President Trump of national monuments designated in the past two decades. Trump directed Interior Secretary Ryan Zinke to recommend steps to eliminate or shrink these monuments or realign their management with Trump administration priorities.

Secretary Zinke’s review was an . During a rushed four-month period, Zinke of the 27 monuments under review. At the end of the review, the Interior Department released to the public only a of Zinke’s report.

In September, the published of Zinke’s detailed recommendations. They included downsizing, changing management plans, or loosening restrictions at a total of 10 monuments, including three ocean monuments.

Trump’s proclamations

Trump’s proclamations on Bears Ears and Grand Staircase-Escalante note the long list of objects that the monuments were created to protect, but claim that many of these objects are “not unique,” “not of significant scientific or historic interest,” or “not under threat of damage or destruction.”

As a result, Trump’s orders into smaller units, excluding large tracts that are deemed “unnecessary.” , including coal-rich portions of the Kaiparowits Plateau, will be reopened to mineral leasing, mining, and other uses.

In our view, Trump’s justification for these changes and the .

What the law says

The key question at issue is whether the Antiquities Act empowers presidents to alter or revoke decisions by past administrations. The gives Congress the power to decide what happens on “territory or other property belonging to the United States.” When Congress passed the Antiquities Act, it delegated a portion of that authority to the president to protect resources or sites that are threatened.

Critics of recent national monuments  that if a president can create a national monument, the next one can undo it. However, the Antiquities Act speaks only of designating monuments. It says nothing about abolishing or shrinking them.

Two other early land management statutes—the Pickett Act of 1910 and the Forest Service Organic Act of 1897—authorized the president to withdraw other types of land, and specifically stated that the president could modify or revoke those actions. In contrast, the Antiquities Act is silent on reversing past decisions.

No president until Trump has attempted to revoke or downsize any national monument.

In 1938, when President Franklin D. Roosevelt considered abolishing the Castle-Pinckney National Monument—a deteriorating fort in Charleston, South Carolina—Attorney General Homer Cummings that the president did not have the power to take this step. (Congress abolished the monument in 1951.)

Congress enacted a major overhaul of public lands law in 1976, the , repealing many earlier laws. However, it did not repeal the Antiquities Act. The House Committee that drafted the 1976 law also made clear in legislative reports that it intended to prohibit the president from modifying or abolishing a national monument, stating that the law would “specifically reserve to the Congress the authority to modify and revoke withdrawals for national monuments created under the Antiquities Act.”

Since that time, no president until Trump has attempted to revoke or downsize any national monument. Trump’s changes to Bears Ears and Grand Staircase-Escalante depend on an argument that presidential declarations about what a national monument protects are subject to second-guessing by subsequent presidents. These claims run counter to every court decision that has examined the Antiquities Act.

Courts have always been deferential to presidents’ use of the law, and no court has ever struck down a monument based on its size or the types of objects it is designed to protect. Congress, rather than the President, has the authority to alter monuments, should it decide that changes are appropriate.

The value of preservation

This summer , as well as and a number of conservation organizations, cited our analysis in letters to Secretary Zinke concluding that the president does not have authority to downsize or revoke national monuments.

Although many national monuments faced vociferous local opposition when they were declared, including Jackson Hole National Monument (now part of ), over time, Americans have come to appreciate them.

Indeed, Congress has converted many into national parks, including , the , , and . These four parks alone attracted in 2016. The aesthetic, cultural, scientific, spiritual, and economic value of preserving them has long exceeded whatever short-term benefit could have been derived without legal protection.

and Grand Staircase-Escalante are home to many natural and archaeological wonders, including scenic bluffs, petroglyphs, burial grounds and other sacred sites, and a rich diversity of plant and animal life. The five Native American tribes that supported protecting Bears Ears, led by the Navajo Nation, have vowed to defend the monuments in court. President Trump’s effort to scale back these monuments oversteps his authority and is unlikely to stand.

This is an updated version of an originally published on April 27, 2017 by . It has been edited for YES! Magazine.