Trump says he wants US troops out of Afghanistan by Christmas

President Donald Trump has said he wants all US troops to leave Afghanistan by Christmas, speeding up the timeline for ending America's longest war.

"We should have the small remaining number of our BRAVE Men and Women serving in Afghanistan home by Christmas!" Trump wrote on Twitter late on Wednesday.

The Taliban welcomed the announcement as a "positive step" in implementing their February 29 agreement with the US that would see all foreign forces leave Afghanistan by May 2021.

In return, the Taliban promised not to allow Afghanistan to be used by trans-national extremist groups such as Al-Qaeda -- the original reason for the 2001 US invasion.

In a statement, the Taliban said they are "committed to the agreement, and want positive relations in the future with all countries, including the United States."

After intense US cajoling, the Afghan government and the Taliban last month opened peace talks in Doha, although negotiations have got off to a slow start.

Trump's promise comes less than a month before US elections in which the president, trailing in polls, has sought to show he is making good on his promise to close out America's "endless wars." 

After 19 years of US military operations his stance enjoys broad support at home including from his Democratic rival Joe Biden, who during his time as vice president had pushed to curtail US involvement in Afghanistan.

Asked last month whether he backed Trump's plans to withdraw troops from both Afghanistan and Iraq, Biden said: "Yes, I do. As long as he has a plan to figure out how he's going to deal with ISIS," the ultra-violent movement that has been active in both countries.

Stalemate in talks

The United States first intervened in Afghanistan following the September 11, 2001 attacks and dislodged the Taliban regime, which had welcomed Al-Qaeda.

But in the years since the resurgent militants have launched a fresh battle to topple the US-backed government in Kabul, with civilians bearing the brunt of spiraling violence since NATO combat troops withdrew in 2014. 

The former Taliban regime had imposed an ultra-conservative brand of Islam on Afghanistan that banned music and education for girls.

The Doha talks have quickly deadlocked over the Taliban's insistence that negotiations adhere to a strict Sunni school of jurisprudence, a step the government says would discriminate against Shiites and other minorities.

Speaking earlier Wednesday, the veteran US diplomat who negotiated with the Taliban, Zalmay Khalilzad, nonetheless voiced guarded hope for the talks.

"The overwhelming majority of the Afghans would like to see an end to the conflict," Khalilzad, speaking by video from Doha, told a forum of the University of Chicago's Pearson Institute. 

"I believe that the Taliban are quite serious about the negotiations. Many thought that they wouldn't sit across the table from the Afghan government -- that all they wanted was an agreement for the withdrawal of US forces. But they are now sitting across the table."

Trump has already reduced US forces in Afghanistan to around 8,600 and the Taliban has stood by promises not to attack Western troops -- even as the militants continue their bloody campaign against government forces.

"The level of violence is too high as far as we're concerned," Khalilzad said, although he asserted that Afghan civilian and military casualties had declined in the first half of 2020.

Afghan President Ashraf Ghani, visiting Doha on Tuesday, called on the Taliban to "have courage" and declare a national ceasefire.

The Trump administration had pressed Ghani's government to release some 5,000 Taliban prisoners, a condition of the militants to start talks

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