Morgan McSweeney has said telling Keir Starmer to appoint Peter Mandelson as U.S. Ambassador was a "serious error of judgement" as the PM's former Chief of Staff told the inquiry: "I got it wrong". #PeterMandelson #KeirStarmer #MorganMcSweeney #ukpolitics #GBNews Keep up to date with GB News at gbnews.com or on X @GBNEWS Become a Friend of GB News: gbnews.com/friend