President Donald Trump announced on Friday that domestic policy advisor Stephen Miller, widely recognized as the mastermind behind the administration's stringent immigration framework, will step into the role of White House Chief of Staff beginning Monday.

Describing Miller—currently serving as White House deputy chief of staff—as “one of my most trusted advisors,” Trump noted that Wiles will transition to a non-governmental capacity within his political operations.

This transition marks the primary major organizational overhaul within the administration following congressional midterm elections earlier in the week, which saw numerous Trump-endorsed Republicans defeated nationwide.

According to the New York Times, Trump openly attributed the midterm setbacks to Wiles, subsequently weighing both Miller and National Intelligence Director Jay Clayton for the vacancy internally.

Miller, a decade-long aide to Trump, is the strategic force behind several of the administration's most aggressive initiatives, encompassing strict immigration protocols, travel bans directed at multiple Muslim-majority nations, and substantial reductions in refugee caps.

Furthermore, he backed Trump's controversial proposal concerning Greenland.

“Serving President Trump in the White House has been the honor of a lifetime,” Wiles wrote in a Friday post. “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.”

Trump's Announcement on Truth Social

“I am pleased to announce that Mr. Stephen Miller, the current Deputy Chief of Staff of the Trump Administration, and one of my most trusted advisors, will become the Chief of Staff starting Monday, November 9, 2026. 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! President DONALD J. TRUMP,” the president stated in his Friday social media post.

Historically, Trump’s West Wing has experienced higher turnover in the Chief of Staff position than nearly any other modern presidency. His first term cycled through four chiefs: Reince Priebus—whose 192-day run remains the shortest for any non-interim chief of staff in history—followed by retired General John Kelly, Mick Mulvaney, and Mark Meadows. Wiles made history last year as the first woman to occupy the office.