The United States will withdraw all its troops from Afghanistan by the 20th anniversary of the September 11 attacks, multiple U.S. media outlets reported on Tuesday.

White House Press Secretary Jen Psaki told reporters at a daily briefing that Biden is expected to make a formal announcement of the decision on Wednesday without getting into details.

Donald Trump's administration had previously set a May 1 deadline for the withdrawal in negotiations with the Taliban.

A senior U.S. official told media outlets that Biden made the decision after consultations with NATO allies and partners in Afghanistan, adding that NATO troops would also leave the country by September 11. 

The official said the new deadline was not conditions-based. 

"The President has judged that a conditions-based approach, which is then the approach of the past two decades, is a recipe for staying in Afghanistan forever," the official said.

The United States and the Taliban signed an agreement in late February 2020 that called for a full withdrawal of foreign forces from Afghanistan by May 2021 if the Taliban meets the conditions of the deal, including severing ties with terrorist groups. 

The disclosure of the plan came on the same day that the U.S. intelligence community released a gloomy outlook for Afghanistan, forecasting "low" chances of a peace deal this year and warning that its government would struggle to hold the Taliban insurgency at bay if the U.S.-led coalition withdraws support.

Meanwhile, Turkey announced Tuesday the Afghan meeting would go ahead on April 24, Mohammad Naeem, spokesman for the Taliban political office, said in a tweet Tuesday that "until all foreign forces completely withdraw from our homeland," the group would "not participate in any conference that shall make decisions about Afghanistan."

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The September 11, 2001 attacks were staged by members of terror group Al-Qaeda, who hijacked four airplanes and crashed three of them into New York and Washington, leaving nearly 3,000 people dead and others missing.

Refusing to hand over Osama Bin Laden, the head of the terror group, who was quickly identified as the man responsible, the U.S. invaded Afghanistan, marking the start of the Afghanistan war against the Taliban.

The Pentagon said there are roughly 2,500 U.S. troops in Afghanistan, but U.S. media recently said the number did not include 1,000 more U.S. special forces in the country. Also, about 7,000 NATO troops in Afghanistan rely on U.S. logistics and security support.

U.S. Secretary of State Antony Blinken and Secretary of Defense Lloyd Austin are in Brussels on Tuesday and Wednesday to inform their NATO counterparts. Germany has the second-largest force in Afghanistan, numbering over 1,000.