US President Donald Trump has said that Stephen Miller was replacing Susie Wiles as White House chief of staff, mere days after Republicans lost control of Congress in the midterm elections.

In a social media post on Friday, Trump called Miller "one of my most trusted advisors" and praised Wiles for doing "an outstanding job," saying the shift would be effective on Monday.

Trump announced the shake-up just three days after Democrats swept the midterm elections, taking control of both the House and Senate and upending America’s political landscape.

“Today is my last day as White House Chief of Staff,” Wiles said in an X post later Friday afternoon. “Serving President Trump in the White House has been the honor of a lifetime.”

“While my role may be changing, my commitment to the President and the mission never will,” she wrote.

Defender of president’s agenda

Trump's political team welcomed the news on X, posting a black-and-white photograph of Miller with the caption: “It’s Miller time.”

Miller, a deputy chief of staff, has played a key role in shaping Trump’s domestic policies, particularly on immigration. He has also been a prominent public defender of the president’s agenda.

Earlier this year, as Trump raised the possibility of taking control of Greenland, Miller argued that the US could intervene in other countries and acquire foreign territory when deemed necessary to protect its national interests.

Trump had four chiefs of staff during his first term.

Reince Priebus served for six months, followed by John Kelly for 17 months.

Mick Mulvaney served in an acting capacity for just over a year, while Mark Meadows served during Trump's final 10 months in office.