'It was time to end a 20-year war' -Biden

"I bear responsibility for, fundamentally, all that's happened of late," Biden told reporters on Thursday when asked if he was responsible for the events of the past two weeks.

Biden also defended his commitment to withdrawing troops. "Ladies and gentlemen, it was time to end a 20-year war," he said.

Islamic State struck the crowded gates of Kabul airport in a suicide bomb attack on Thursday, killing scores of civilians and 12 U.S. troops, and throwing into mayhem the airlift of tens of thousands of Afghans desperate to flee.

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