"All sides were agreed that Qatar will announce it. Trump's tweets on such occasion are surprising who has damaged his own reputation", he said. If not, then we are already on the battlefield of jihad.
Trump has long promised to end US involvement in the war and said Monday the Afghan government "will have to take responsibility" for its own security "at the earliest possible time".
If deadly Taliban attacks on American servicemen and women were a deal-breaker for Trump, why did his administration keep the talks going during previous Taliban murders?
The US president has made withdrawing US troops from Afghanistan a key foreign policy aim, but asked about the 14,000 US troops still there he said: "We'd like to get out but we'll get out at the right time".
On Saturday night, the president announced, in a series of posts to Twitter, that he had called off secret meetings with Taliban leaders and representatives of the Afghanistan government - and that the whole peace process had been put on hold.
On Sunday, Secretary of State Mike Pompeo said that 'we've killed over a thousand Taliban in just the last 10 days'.
The talks, which had been secret until Trump unexpectedly announced their cancellation on Saturday, would have brought the US president face-to-face with senior Taliban leaders at the presidential compound in Camp David, Maryland.
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Like his attitude is something that it's - I think it's close to the perfection. "We had some unbelievable level". Nadal stands in his manner, with targets past profitable a fourth US Open title additionally in his sights.
Trump was criticised, even by some fellow Republicans, for having offered to host on U.S. soil a militant group that has killed American troops and had sheltered al Qaeda leader Osama bin Laden after the September 11, 2001 attacks. He blamed a Taliban attack last Thursday that killed a USA soldier, an attack he said proved the Taliban were negotiating in bad faith. Badakhshan never fell under Taliban control when the militants ruled the country in the 1990s, but several districts in the province have been overrun by the militants in recent years. He was the fourth US service member killed in the past two weeks in Afghanistan.
Wednesday will mark the 18th anniversary of the 9/11 Al Qaeda attacks that killed more than 3,000 people in New York, Washington and Pennsylvania.
Trump tweeted. "If they can not agree to a ceasefire during these very important peace talks, and would even kill 12 innocent people, then they probably don't have the power to negotiate a meaningful agreement anyway".
Almost 3,500 members of the global coalition forces have died in Afghanistan since the 2001 invasion, more than 2,300 of them American. Far from guaranteeing a cease-fire, the deal only included Taliban commitments to reduce violence in Kabul and neighboring Parwan province, where the USA has a military base.
McKenzie said during a visit to Afghanistan that the Taliban "overplayed their hand" in peace negotiations by carrying out a spate of high profile attacks, including one that killed a US soldier last week.
The lead American negotiator, Zalmay Khalilzad, had been recalled to the United States, Pompeo added.
Trump chose to get personally involved to get the agreement to the finish line at Camp David after "real progress" had been made in talks, Pompeo said. There would also be follow-on talks between the Taliban and Afghan government.