In the days that followed, Mr. Trump came up with an even more remarkable idea — he would not only bring the Taliban to Washington, but to Camp David, the crown jewel of the American presidency. The leaders of a rugged militant organization deemed terrorists by the United States would be hosted in the mountain getaway used for presidents, prime ministers and kings just three days before the anniversary of the Sept. 11, 2001, attacks that led to the Afghan war.
Thus began an extraordinary few days of ad hoc diplomatic wrangling that upended the talks in a weekend Twitter storm. On display were all of the characteristic traits of the Trump presidency — the yearning ambition for the grand prize, the endless quest to achieve what no other president has achieved, the willingness to defy convention, the volatile mood swings and the tribal infighting.
What would have been one of the biggest headline-grabbing moments of his tenure was put together on the spur of the moment and then canceled on the spur of the moment. The usual National Security Council process was dispensed with; only a small circle of advisers was even clued in.
And even after it fell apart, Mr. Trump took it upon himself to disclose the secret machinations in a string of Saturday night Twitter messages that surprised not only many national security officials across the government but even some of the few who were part of the deliberations.