President Donald Trump's administration is facing a major shakeup following Republicans' crushing defeat in the 2026 US midterm elections, which saw Democrats capture control of both the House of Representatives and the Senate. In the first major personnel change after the electoral setback, Trump announced that longtime White House chief of staff Susie Wiles would be replaced by Stephen Miller, one of his closest advisers and a leading architect of his immigration agenda. Wiles is moving to Trump's political operation, while Miller is set to take over on November 9.