How to hit the 3.5% of GDP spending promise made to Nato would be a matter for the next prime minister, MPs told

The Treasury has as yet carried out no analysis of the trade-offs necessary for the UK to hit the 3.5% of GDP defence spending promise made to Nato, the department’s chief secretary has said.

Under robust questioning in a joint session of the Treasury and defence committees on Wednesday, Lucy Rigby repeatedly said funding additional defence spending would be a matter for “the next prime minister”.