WASHINGTON (AP) — President-elect Donald Trump will sign a series of executive orders designed to beef up security at the southern border by relying more on the U.S. military and redefining who gets to become an American, preparing to make good on his defining political promise to crack down on immigration.

But actual execution of such a far-reaching immigration agenda is certain to face legal and logistical challenges.

The orders previewed Monday by an incoming White House official before Trump takes office will aim to end asylum access, send troops to the U.S.-Mexico border, suspend the refugee program, force people seeking asylum to wait in Mexico and end birthright citizenship. There was little detail on specifically how these broad plans would be executed.

Many of the steps echoed previous ones during Trump's first administration that also faced lawsuits. Others — like the effort to end the constitutional right to automatic citizenship for anyone born in the U.S. — marked sweeping new strategies that are expected to elicit pushback in the courts.

The official spoke on condition of anonymity to provide details before the orders are signed, some of them soon after he's inaugurated Monday.

Immigrant communities around the country have been bracing for a crackdown that the incoming Republican president had been promising throughout his campaign and again at a rally Sunday.

The orders previewed were less specific about how Trump will fulfill his pledge of mass deportations of at least 11 million people already in the country illegally. One edict will equip immigration officers with “authorities needed” to enforce the law.

Trump and his aides have repeatedly said they would scrap President Joe Biden’s deportation priorities, which focused on people with criminal records and those who are national security threats, to include all people without legal status.

A key announcement was the effort to end birthright citizenship — one of Trump’s most sweeping immigration efforts yet.

Birthright citizenship means anyone born in the United States automatically becomes an American citizen, a right enshrined in the 14th Amendment that was ratified in 1868 in the wake of the Civil War and assured citizenship for all, including Black people.

It applies to children born to someone in the country illegally or in the U.S. on a tourist or student visa who plans to return to their home country. Trump's effort to end that right is certain to face steep legal challenges, and the incoming White House official provided no information on how he intends to carry it out.

Trump also intends to suspend refugee resettlement for four months, the official said. That's a program that for decades has allowed hundreds of thousands of people from around the world fleeing war and persecution to come to the United States.

Trump similarly suspended the refugee program at the beginning of his first term, and then after reinstating it, cut the numbers of refugees admitted into the country every year.

The incoming administration also will order an end to releasing migrants in the U.S. while they await immigration court hearings, a practice known as “catch-and-release,” but officials didn’t say how they would pay for the enormous costs associated with detention.

Trump plans to “end asylum,” presumably going beyond what Biden has done to severely restrict it. It is unclear what the incoming administration will do with people of nationalities whose countries don’t take back their citizens, such as Nicaragua and Venezuela.

And it would reinstate the first Trump administration’s “Remain in Mexico” policy, which forced about 70,000 asylum-seekers to wait in Mexico for hearings in U.S. immigration court. That measure would require cooperation from Mexico, and it is unclear how it jibes with pledges to end asylum altogether.

Trump will order the government, with Defense Department assistance, to “finish” construction of the border wall, though the official didn’t say how much territory that would cover. Barriers currently span about 450 miles (720 kilometers), slightly more than one-third of the border. Many areas that aren’t covered are in Texas, including inhospitable terrain where migrants rarely cross.

Sending troops to the border is a strategy that Trump has used before, as has Biden. In 2018, Trump deployed 800 active-duty troops to assist Border Patrol personnel in processing large migrant caravans. And in 2023, with the U.S. preparing to end pandemic-era restrictions on immigration, the Biden administration sent 1,500 active-duty troops to the U.S.-Mexico border.

Both administrations also used National Guard troops along the border.

The official did not say how many troops Trump was planning to send, saying that would be up to the secretary of defense or what their role would be when they get there.

Historically, troops have been used to back up Border Patrol agents, who are responsible for securing the nearly 2,000-mile border separating the U.S. from Mexico and not in roles that put them in direct contact with migrants.

Critics have said that sending troops to the border sends the signal that migrants are a threat.

A mother thanks notary Adela Morales, right, and Nora Sandigo, left, after she signed documents giving Sandigo legal guardianship of her children, Sunday, Jan. 19, 2025, in Miami. Since December, Sandigo has become the legal guardian of at least 30 children. She has been doing so for 15 years and is the legal guardian to more than 2,000 children of undocumented immigrants. (AP Photo/Marta Lavandier)

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Nora Sandigo, left, listens to a mother as she decides what to do about her U.S. born children if she is detained or deported, Sunday, Jan. 19, 2025, in Miami. (AP Photo/Marta Lavandier)

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A mother reads a pamphlet to help her family prepare in the event she is apprehended by immigration authorities, Sunday, Jan. 19, 2025, in Miami. (AP Photo/Marta Lavandier)

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A young mother signs a form giving Nora Sandigo legal guardianship of her children if she is detained or deported by immigration authorities, Sunday, Jan. 19, 2025, in Miami. (AP Photo/Marta Lavandier)

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A young man reacts to information on how to prepare for the upcoming changes to undocumented families living in the U.S., Sunday, Jan. 19, 2025, in Miami. (AP Photo/Marta Lavandier)

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A mother embraces her son after signing a document giving Nora Sandigo legal guardianship of her minor children if she is detained or deported by immigration authorities, Sunday, Jan. 19, 2025, in Miami. Sandigo runs a non-profit organization that helps immigrants and their families. (AP Photo/Marta Lavandier)

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Nora Sandigo holds a folder with documents signed by families giving her legal guardianship of their children, Sunday, Jan. 19, 2025, in Miami. Since December, Sandigo has become the legal guardian of at least 30 children. She has been doing so for 15 years and is the legal guardian to more than 2,000 children. (AP Photo/Marta Lavandier)

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Church members hold hands together during a service at St. Rita of Cascia Parish in Chicago, Sunday, Jan. 19, 2025. (AP Photo/Nam Y. Huh)

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Priest Homero Sanchez reacts as he speaks during a service at St. Rita of Cascia Parish in Chicago, Sunday, Jan. 19, 2025. (AP Photo/Nam Y. Huh)

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Church members attend a service at St. Rita of Cascia Parish in Chicago, Sunday, Jan. 19, 2025. (AP Photo/Nam Y. Huh)

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Church members pray during a service at St. Rita of Cascia Parish in Chicago, Sunday, Jan. 19, 2025. (AP Photo/Nam Y. Huh)

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Priest Homero Sanchez speaks during a service at St. Rita of Cascia Parish in Chicago, Sunday, Jan. 19, 2025. (AP Photo/Nam Y. Huh)

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FILE - A U.S. deportation officer changes the handcuffs of Wilmer Patricio Medina-Medina from back to front after arresting him during an early morning operation, Dec. 17, 2024, in the Bronx borough of New York. (AP Photo/Julia Demaree Nikhinson, File)

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FILE - A member of the Texas delegation holds a sign during the Republican National Convention, July 17, 2024, in Milwaukee. (AP Photo/Matt Rourke, File)

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FILE - Former President Donald Trump speaks at the New Hampshire Federation of Republican Women Lilac Luncheon, June 27, 2023, in Concord, N.H. (AP Photo/Steven Senne, File)

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FILE - A deportation officer changes the handcuffs of Wilmer Patricio Medina-Medina from back to front after arresting him during an early morning operation, Dec. 17, 2024, in the Bronx borough of New York. (AP Photo/Julia Demaree Nikhinson, File)

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FILE - Kenneth Genalo, director of U.S. Immigration and Customs Enforcement's New York City field office, holds an information sheet on Wilmer Patricio Medina-Medina during an early morning operation, Dec. 17, 2024, in the Bronx borough of New York. (AP Photo/Julia Demaree Nikhinson, File)

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FILE - An immigrant considered a threat to public safety and national security has his fingerprints scanned as he is processed for deportation by U.S. Immigration and Customs Enforcement agents at the ICE Metropolitan Detention Center in Los Angeles, June 6, 2022. (AP Photo/Damian Dovarganes, File)

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