President Donald Trump on Wednesday signed directives to build a wall along the U.S. border with Mexico and crack down on U.S. cities that shield illegal immigrants, proceeding quickly on sweeping and divisive plans to curb immigration and boost national security.
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The Republican president is also expected to take steps in the coming days to limit legal immigration, including executive orders restricting refugees and blocking the issuing of visas to people from several Muslim-majority Middle Eastern and North African countries including Syria, Sudan, Somalia, Iraq, Iran, Libya and Yemen.
Trump signed two executive orders during an appearance at the Department of Homeland Security, one on building a wall along the roughly 2,000-mile (3,200-kilometer) U.S.-Mexico border and the other to strip federal grant money from "sanctuary" states and cities, often governed by Democrats, that harbor illegal immigrants.
In cities such as San Francisco local officials, often Democrats, refuse to cooperate with federal authorities on actions against illegal immigrants.
"The American people are no longer going to have to be forced to subsidize this disregard for our laws," White House spokesman Sean Spicer said.
In an interview with ABC News on Wednesday, Trump said construction on the wall would start within months, with planning starting immediately, and that Mexico would pay back to the United States "100 percent" of the costs.
His plans, which he has said are necessary to protect Americans from crimes committed by illegal immigrants, prompted an immediate outcry from immigrant advocates who said Trump was jeopardizing the rights and freedoms of millions of people.
"The border wall is about political theater at the expense of civil liberties," said Christian Ramirez, director of the Southern Border Communities Coalition immigrant advocacy group.
"It is not national security policy. Border communities are among the safest in the nation and patrolling them with tens of thousands of heavily armed, poorly trained, unaccountable agents puts lives at risks. This will turn these communities into de facto military zones," Ramirez said.
Trump made cracking down on illegal immigration a key element of his presidential campaign, with supporters often chanting "build the wall" during his rallies.
The cost, nature and extent of the wall remain unclear. Trump last year put the cost at "probably $8 billion," although other estimates are higher, and said the wall would span 1,000 miles (1,600 km) because of the terrain of the border.
Many Democrats have opposed the plan and could try to thwart any legislation to pay for the construction in the U.S. Congress, although Republicans control both the Senate and House of Representatives.
Spicer said that Trump would also end the practice known by critics as "catch and release" in which authorities apprehend illegal immigrants on U.S. territory but do not immediately detain or deport them.
Trump's actions could fundamentally change the American stance on immigration, as well as further testing relations with Mexico.
Many Americans view their country with pride as "a nation of immigrants," and President John Kennedy wrote a book with that title more than half a century ago. But Trump successfully tapped into resentment toward the roughly 11 million illegal immigrants already in the United States and said during the campaign he would deport them all.
Trump, who in announcing his presidential bid in June 2015 accused Mexico of sending rapists and criminals into the United States, has also threatened to slap hefty taxes on companies that produce in Mexico for the U.S. market and to tear up the North American Free Trade Agreement (NAFTA) between the Mexico, Canada and the United States.
Trump and Mexican President Enrique Pena Nieto are due to meet next week.