President Trump will be able to appoint a new Fed Governor on February 1, 2026 (replacing Adriana Kugler), who could then potentially be appointed Fed Chair around four months later (after Powell's term as chair expires in May 2026).
"on February 1st 2026 Trump will be able to put somebody new into that job and that's about 4 and a half months before 's term as chair is up so presumably whoever gets that seat could become the chair four months later"