“People are going to die, and they are going to be left behind,” Mr. McCaul said.
Mr. Biden has emphasized that he was taking the threats to the safety of Americans in Kabul seriously. In a closed-door meeting with leaders of the Group of 7 nations on Tuesday, the president told them that the danger of a terrorist attack was “very high,” according to a senior American official.
A deadly attack against American and Afghan civilians by ISIS-K would be a disaster not only for the United States, but also for the Taliban, who are moving to consolidate control over Kabul. The Taliban and the Islamic State have been enemies, fighting each other on the battlefield for control of parts of the country.
Understand the Taliban Takeover in Afghanistan
Who are the Taliban? The Taliban arose in 1994 amid the turmoil that came after the withdrawal of Soviet forces from Afghanistan in 1989. They used brutal public punishments, including floggings, amputations and mass executions, to enforce their rules. Here’s more on their origin story and their record as rulers.
ISIS-K refers to the Islamic State’s Khorasan affiliate in Afghanistan.
Prime Minister Boris Johnson of Britain, who led the meeting, sought to put a good face on the discussions, saying the evacuation had been remarkably successful. He said leaders had agreed on a road map for dealing with the Taliban in the long term, vowing to use Afghan funds held in Western banks as a lever to pressure the Taliban.
“The No. 1 condition is that they’ve got to guarantee, right the way through to Aug. 31 and beyond, safe passage for those who want to come out,” Mr. Johnson said to the BBC after the meeting.
But Mr. Johnson failed in his effort to persuade Mr. Biden to extend the evacuation beyond Aug. 31, and it was not clear what other options the allies had to protect their own citizens and Afghan allies without American military might.
Chancellor Angela Merkel of Germany said that plans were being made to find a way to ensure that “afterward we can still get as many local employees and people needing protection to be allowed to leave the country.” But her downbeat tone laid bare the sense of futility felt by Western leaders about Afghanistan.
“How can it be that the Afghan leader left the country so quickly?” Ms. Merkel said. “How can it be that Afghan soldiers who we trained for so long gave up so quickly? We will have to ask these questions, but they were not the most pressing today.”