No guarantees about Afghanistan's future post-pullout: White House

No one can offer guarantees about Afghanistan's future after US troops leave, a top White House official said on Sunday, even as he stressed the United States would stay focused on terrorist threats emanating from the country.

President Joe Biden announced on Wednesday that the United States will withdraw its remaining 2,500 troops from Afghanistan by Sept 11, the 20th anniversary of the al Qaeda attacks that triggered America's longest war.

White House National Security Advisor Jake Sullivan was asked on the Fox News Sunday programme about the risk of a repeat of what happened in Iraq, where Islamic State militants seized territory after US troops withdrew in 2011.

That led then-President Barack Obama to send troops back into Iraq.

Sullivan said Biden had no intention of sending American forces back to Afghanistan, but he added: "I can't make any guarantees about what will happen inside the country. No one can."

"All the United States could do is provide the Afghan security forces, the Afghan government and the Afghan people resources and capabilities, training and equipping their forces, providing assistance to their government. We have done that and now it is time for American troops to come home and the Afghan people to step up to defend their own country."

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CIA Director William Burns told the Senate Intelligence Committee on Wednesday that America's ability to collect intelligence and act against extremist threats in Afghanistan will diminish after the departure of US troops.

A United Nations report in January said there were as many as 500 al Qaeda fighters in Afghanistan and that the Taliban maintained a close relationship with the extremist group. The Taliban denies al Qaeda has a presence in Afghanistan.

Announcing his decision to withdraw troops, Biden said the United States would monitor the threat, reorganise counterterrorism capabilities and keep substantial assets in the region to respond to threats to the United States emerging from Afghanistan.

"He has no intention of taking our eye off the ball," Sullivan said of the president.

"We have the capacity, from repositioning our capabilities over the horizon, to continue to suppress the terrorist threat in Afghanistan."