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said on Wednesday that the United States "lost" the 20-year war in Afghanistan.

"It is clear, it is obvious to all of us, that the war in Afghanistan did not end on the terms we wanted, with the Taliban in power in Kabul," chairman of the US Joint Chiefs of Staff, told the House Armed Services Committee.

"The war was a strategic failure," Milley told a committee hearing about the US troop pullout from Afghanistan and the

"It wasn't lost in the last 20 days or even 20 months," Milley said.

"There's a cumulative effect to a series of strategic decisions that go way back," said the general, the top military advisor to , who ordered an end to the 20-year US troop presence in Afghanistan.

"Whenever you get some phenomenon like a war that is lost - and it has been, in the sense of we accomplished our strategic task of protecting America against Al-Qaeda, but certainly the end state is a whole lot different than what we wanted," Milley said.

"So whenever a phenomenon like that happens, there's an awful lot of causal factors," he said. "And we're going to have to figure that out. A lot of lessons learned here."

Milley listed a number of factors responsible for the US defeat going back to a missed opportunity to capture or kill Al-Qaeda leader at Tora Bora soon after the 2001 US invasion of Afghanistan.

He also cited the 2003 decision to invade Iraq, which shifted US troops away from Afghanistan, "not effectively dealing with Pakistan as a [Taliban]Ìýsanctuary," and pulling advisers out of Afghanistan a few years ago.

Biden, in April, ordered a complete pullout of US forces from by August 31, following through on an agreement reached with the Taliban by former president Donald Trump.

Milley and General Kenneth McKenzie, commander of US Central Command, told a Senate committee on Tuesday that they had personally recommended that some 2,500 troops remain on the ground in Afghanistan.

White House press secretary Jen Psaki said had received "split" advice about what to do in Afghanistan, which the United States invaded following the September 11Ìý2001 Al-Qaeda attacks on New York and Washington.

"Ultimately, it's up to the commander-in-chief to make a decision," Psaki said. "He made a decision that it was time to end a 20-year war."