Nuclear secrets reportedly found at Mar-a-Lago are ‘gamechanger’, experts say – as it happened

Report appears to confirm security officials' worst fears about the nature of the material Trump refused to hand back

• Sign up to receive First Thing - our daily briefing by email

Former Trump administration defense secretaries Jim Mattis and Mark Esper have joined a group of retired military officers who have written an open letter warning of an extremely adverse environment" for the military - a thinly-veiled attack on the former president's efforts to use servicemen and women to advance his political goals.

Military officers swear an oath to support and defend the Constitution, not an oath of fealty to an individual or to an office," the letter, published by the online security analysis website War on the Rocks, states.