U.K. leader Starmer faces more pressure over Mandelson ambassador appointment Apr 28, 2026 · Jill Lawless · washingtontimes.com read more » U.K. Prime Minister Keir Starmer's former chief of staff said Tuesday that he made a "serious mistake" by recommending Peter Mandelson be made U.K. ambassador to the United States, but denied interfering with the appointment process. Read more »