Stephen Miller will be Trump’s deputy policy chief

President-elect Donald Trump is naming longtime adviser Stephen Miller as deputy policy chief of his new administration.

Vice President-elect JD Vance posted a congratulatory message to Miller on X on Monday, saying, “This is another fantastic presidential choice.” The announcement was first reported by CNN.

Miller was a senior White House policy adviser during Trump’s first term and the driving force behind the Republican’s far-reaching immigration policy decisions. The policies included building a wall on the U.S.-Mexico border, banning people from certain Muslim-majority countries and elsewhere, and a controversial 2018 border policy that separated thousands of migrant families.

Trump said in a social media post overnight that Tom Homan, former acting Immigration and Customs Enforcement director from his first administration, would be in charge of the country’s borders in his new administration.

Miller helped craft many of Trump’s speeches and plans on immigration. He told The New York Times last year that detention camps would likely be built “on open land in Texas near the border.”

Trump told Time There is unlikely to be a “great need” for camps as officials will seek to quickly deport the migrants.

The president-elect made combating illegal immigration a central plank of his election campaign and promised mass deportations “on day one.”

Vance told The times Last month the government was able to begin one million deportations per year, a huge jump compared to previous administrations. According to the Department of Homeland Security, his administration deported about 1.5 million people during Trump’s first four years in office.

Since Trump left office, Miller has been president of America First Legal, an organization of former Trump advisers that was founded as a conservative version of the American Civil Liberties Union.

Associated Press, Reuters and Dallas Morning News Staff Aaron Torres And Nolan D McCaskill contributed to this report.