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During Prime Minister's Questions on Wednesday, Sir Keir Starmer listed policies which had "gone" before asking why the PM was still here.
Liz Truss responded that she was a "fighter, not a quitter".
Former Labour government minister Lord Mandelson, then Peter Mandelson MP, used the phrase in a 2001 speech.
LIVE: Truss tells MPs she will raise pensions in line with inflation