President Donald Trump announced Friday that Stephen Miller will replace Susie Wiles as White House chief of staff, effective Monday.

Trump made the announcement on his Truth Social account, describing Miller as "one of my most trusted advisors."

Miller currently serves as deputy chief of staff at the White House. He has been a close confidant of Trump across both presidential terms, first joining Trump's campaign as an adviser in 2016.

He is widely regarded as the principal architect of the administration's hardline immigration, border, and deportation policies.

Wiles, who has been credited with orchestrating Trump's 2024 election comeback and has served as chief of staff since the first day of the administration, will move to the Trump Political Operation.

Trump praised her record in his announcement. "Susie Wiles, who has done an outstanding job, will be moving over to the Trump Political Operation. I want to thank her for her service as Chief of Staff — She has done a great job!"

Wiles also responded to the transition. "I'm so proud to have been a part of what we've accomplished together, from securing our border and cutting taxes to strengthening our economy and putting America First," she said, calling the role "the honour of a lifetime."

Wiles had previously worked with Trump's 2020 campaign in Florida. She was diagnosed with breast cancer earlier this year but was announced to be cancer-free this fall.

The staff change follows this week's midterm elections, in which Republicans suffered significant losses. Democrats netted seven Senate seats, with results still being counted in Alaska and Mississippi. Democrats also won 253 seats in the 435-member House of Representatives, with 27 races still outstanding.

Miller's appointment is seen as a continuation of the administration's most controversial policy positions rather than a shift in direction following the electoral setback.

On election day, Miller urged Trump supporters to vote in a post on X. "Send a message to the corrupt media, corrupt Democrats and corrupt left-wing politicians who want to steal your future and destroy the inheritance of your children," he wrote. "Get to the polls and protect the ones you love."

Democrats are widely expected to launch investigations into Miller when they take control of both chambers of Congress in January.

Miller has not commented publicly on the election results.