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WASHINGTON (AP) — President Donald Trump moved aggressively to tighten the nation's immigration controls Wednesday, signing executive actions to jumpstart construction of his promised U.S.-Mexico border wall and cut federal grants for immigrant-protecting "sanctuary cities." As early as Thursday, he is expected to pause the flow of all refugees to the U.S. and indefinitely bar those fleeing war-torn Syria.

"Beginning today the United States of America gets back control of its borders," Trump declared during a visit to the Department of Homeland Security. "We are going to save lives on both sides of the border."

The actions, less than a week into Trump's presidency, fulfilled pledges that animated his candidacy and represented a dramatic redirection of U.S. immigration policy. They were cheered by Republicans allies in Congress, condemned by immigration advocates and triggered immediate new tension with the Mexican government.

"I regret and reject the decision of the U.S. to build the wall," Mexican President Enrique Pena Nieto said Wednesday in a nationally televised address.

Trump is expected to wield his executive power again later this week with the directive to dam the refugee flow into the U.S. for at least four months, in addition to the open-ended pause on Syrian arrivals.

The president's upcoming order is also expected to suspend issuing visas for people from several predominantly Muslim countries — Iran, Iraq, Libya, Somalia, Sudan, Syria and Yemen — for at least 30 days, according to a draft executive order obtained by The Associated Press.

Trump is unveiling his immigration plans at a time when detentions at the nation's southern border are down significantly from levels seen in the late 1990s and early 2000s. The arrest tally last year was the fifth-lowest since 1972. Deportations of people living in the U.S. illegally also increased under President Barack Obama, though Republicans criticized him for setting prosecution guidelines that spared some groups from the threat of deportation, including those brought to the U.S. illegally as children.

As a candidate, Trump tapped into the immigration concerns of some Americans who worry both about a loss of economic opportunities and the threat of criminals and terrorists entering the country. His call for a border wall was among his most popular proposals with supporters, who often broke out in chants of "build that wall" during rallies.

Immigration advocates and others assailed the new president's actions. Omar Jadwat, director of the American Civil Liberties Union's Immigrants' Rights Project, said the president's desire to construct a border wall was "driven by racial and ethnic bias that disgraces America's proud tradition of protecting vulnerable migrants."

How Trump plans to pay for the wall project is murky. While he has repeatedly promised that Mexico will foot the bill, U.S. taxpayers are expected to cover the initial costs and the new administration has said nothing about how it might compel Mexico to reimburse the money.