Speaking at the Pentagon to mark the 18th anniversary of the 9/11 attacks, President Trump promised that if "they come back to our country, we will go wherever they are and use power the likes of which the United States has never used before".
"I'm frankly relieved because I think all of the signs were that the Taliban was not serious about an agreement that was acceptable to us", she said, adding that the Taliban was unlikely to make "guarantees" about keeping terrorists out of the country.
India supports direct talks between the elected Afghan leadership and the Taliban to end the violence there, he said.
Many Afghans fear his cancelling the talks will mean more carnage as the US and Taliban, as well as Afghan forces, step up their offensives and civilians die in the crossfire.More news: Federal party leaders kick off 2019 election campaigns
Trump said Saturday he meant to hold a secret meeting with Taliban representatives at Camp David, but called it off due to the Taliban's role in a deadly bombing in Kabul last week that killed a USA soldier.
Relatives read out the long list of those who were killed, and held placards with images of their loved ones.
He said: "What they did was disgusting, they killed an American soldier".
Norma Molina leaves flowers by the names of firefighters from Engine 33 at the memorial.More news: Kentucky on guard as illnesses tied to vaping spreads
Former Secretary of State Condoleezza Rice said on Tuesday that the timing of President Trump's proposed talks with the Taliban at Camp David was "not ideal". A fourth plane crashed in Pennsylvania after passengers attempted to retake control of the aircraft. Clearly, the talks failed on other grounds-most likely, the Taliban were not willing to accept USA conditions, and the United States was not able to convince the government in Kabul to go along with an agreement.
For the first time, more Afghan civilians have been killed by worldwide and Afghan forces than by the Taliban and other insurgents, the United Nations said of the first three months of this year, with thousands more wounded by insurgent attacks.
The US and the Taliban have for almost a year been attempting to negotiate a peace deal that would ensure the withdrawal of foreign troops in exchange for the movement's guarantee that the country will not become a safe haven for terrorists. For Mr. Trump, this is a major election promise that he would like to fulfill before the next election.More news: China removes several US products from tariffs list