The Pentagon is moving thousands of Marines into position for a possible evacuation of the American Embassy and U.S. citizens in Kabul as the Biden administration braces for a possible collapse of the Afghan government within 30 days, administration and military officials said.

The sharply deteriorating situation in Afghanistan, as the Taliban rapidly advance across the north and Afghan security forces battle to defend ever shrinking territory in the south and west, has forced the Defense Department to accelerate plans to get Americans out of the country. Officials say any evacuation will involve a robust use of American military force to move people to Hamid Karzai International Airport to waiting military transport planes and to protect them en route.

American negotiators are also trying to extract assurances from the Taliban that they will not attack the embassy if they overrun the capital, two American officials said.