Yahoo TV

Thousands of civilians desperate to flee Afghanistan thronged Kabul airport's single runway on Monday after the Taliban seized the capital, prompting the United States to suspend evacuations as it came under mounting criticism at home.

Five people were reported killed in the chaos. A U.S. official told Reuters two gunmen had been killed by U.S. forces there over the past 24 hours.

"I stand squarely behind my decision," Biden said. "After 20 years I've learned the hard way that there was never a good time to withdraw U.S. forces. That's why we're still there."

"The truth is: this did unfold more quickly than we anticipated. So what's happened? Afghanistan political leaders gave up and fled the country. The Afghan military gave up, sometimes without trying to fight," Biden said.

Biden coupled his defense with a warning to Taliban leaders: let the U.S. withdrawal proceed unimpeded or face devastating force.