US President Donald Trump has said he had called off a secret summit with the Taliban and Afghanistan’s leader, abruptly slamming the door on a year of diplomacy to end America’s longest war.

In a weekend bombshell, Trump said that he had planned previously unknown talks with the two sides Sunday in Camp David, the presidential retreat in Maryland, but that the Taliban’s persistent, grisly campaign of violence made them untrustworthy partners.

A US soldier and another service member from Romania were killed in a car bombing on Thursday in Kabul, the latest major attack claimed by the Taliban even as they negotiated with a US envoy.

If realized, the summit would have been the latest high-profile, high-stakes diplomacy by the mogul-turned-president, who is fond of dramatic gestures.