Chris Mason: What John Healey's resignation means

John Healey resigned as Defence Secretary, criticizing Keir Starmer's government for being 'unwilling and unable' to commit resources to national defence. He is the sixth minister to resign from the Labour government since last month's poor election results. His resignation came on the day the long-awaited Defence Investment Plan was expected to be published but was delayed due to internal rows. Healey was due to attend a NATO defence ministers meeting next week, and a crucial by-election in Makerfield is approaching.