BRUSSELS — Expanding joint EU debt issuance would save governments billions of euros in borrowing costs, former Italian Prime Minister Enrico Letta told POLITICO in an interview. "A safe asset is not a way to have more debt and to waste money. A safe asset is a way to save money," said Letta, who authored an influential report in 2024 on how to reboot the European single market. For decades, EU governments have sparred over whether the European Commission should issue debt on behalf of its 27