President-elect Donald Trump is starting to fill key posts in his second administration, putting an emphasis on aides and allies who were his strongest backers during the 2024 campaign and those who have taken a hard line on immigration.

Here’s a look at who he’s selected so far.

Susie Wiles, chief of staff

Wiles, 67, was a senior adviser to Trump’s 2024 presidential campaign and its de facto manager.

Wiles has a background in Florida politics. She helped Ron DeSantis win his first race for Florida governor. Six years later, she was key to Trump’s defeat of him in the 2024 Republican primary.

Wiles’ hire was Trump’s first major decision as president-elect and one that could be a defining test of his incoming administration considering her close relationship with the president-elect. Wiles is said to have earned Trump’s trust in part by guiding what was the most disciplined of Trump’s three presidential campaigns.

Wiles was able to help keep Trump on track as few others have, not by criticizing his impulses, but by winning his respect by demonstrating his success after taking her advice.

Tom Homan, ‘border czar’

Homan, 62, has been tasked with Trump’s top priority of carrying out the largest deportation operation in the nation’s history.

Hours after being named border czar by Trump, Homan appeared on Fox News and discounted criticism over policies he implemented during the president-elect’s first term that separated undocumented migrant children from their family members.

“I don’t care what people think about me. Especially on the left,” Homan said, noting that aggressive measures were necessary “when you have a crisis this big.”

Homan suggested  at a July conference in Washington that he would be willing to “run the biggest deportation operation this country’s ever seen.”

Democrats have criticized Homan for his defending Trump’s “zero tolerance” policy on border crossings during his first administration, which led to the separation of thousands of parents and children seeking asylum at the border.

Stephen Miller, deputy chief of staff for policy

Miller, also an immigration hardliner, was a vocal spokesperson during the presidential campaign for Trump’s priority of mass deportations. The 39-year-old was a senior adviser during Trump’s first administration.

Miller has been a central figure in some of Trump’s policy decisions, notably his move to separate thousands of immigrant families.  He was also the chief architect of his controversial travel ban.

Trump argued throughout the campaign that the nation’s economic, national security and social priorities could be met by deporting people who are in the United States illegally.

Since Trump left office in 2021, Miller has served as the president of America First Legal, an organization made up of former Trump advisers aimed at challenging the Biden administration, media companies, universities and others over issues such as free speech and national security. Miller will serve under Wiles.

Elise Stefanik, United Nations ambassador

Stefanik is a representative from New York and one of Trump’s staunchest defenders going back to his first impeachment.

Elected to the House in 2014, Stefanik was selected by her GOP House colleagues as House Republican Conference chair in 2021, when former Wyoming Rep. Liz Cheney was removed from the post after publicly criticizing Trump for falsely claiming he won the 2020 election.

Stefanik, 40, has served in that role ever since as the third-ranking member of House leadership.

Stefanik’s questioning of university presidents over antisemitism on their campuses helped lead to two of those presidents resigning, further raising her national profile.

If confirmed, she would represent American interests at the U.N. as Trump vows to end the war waged by Russia against Ukraine begun in 2022. He has also called for peace as Israel continues its offensive against Hamas in Gaza and its invasion of Lebanon to target Hezbollah.

Lee Zeldin, Environmental Protection Agency

Trump also announced Monday he has chosen former New York Rep. Lee Zeldin to serve as his pick to lead the Environmental Protective Agency.

Zeldin is a longtime supporter of the former president. In an interview Monday on Fox News, Zeldin, 44, said that he’ll seek to ensure that the United States is able to “pursue energy dominance … bring back American jobs to the auto industry and so much more.”

In the 2022 governor’s race, Zeldin vowed to reverse a fracking ban imposed by Democrats.

Zeldin was among the Republicans in Congress who voted against certifying the 2020 election results. While in Congress, he did not serve on committees with oversight of environmental policy and had a lifetime score of 14% from the League of Conservation Voters during his eight years in Congress.

President-elect Donald Trump says that Tom Homan, his former acting U.S. Immigration and Customs Enforcement director, will serve as “border czar” in his incoming administration. (AP Photo/John Bazemore, File)
Stephen Miller (AP Photo/Evan Vucci, File)

Former Rep. Lee Zeldin, R-N.Y. (AP Photo/Matt Rourke, File)