discussions on whether to stay beyond the august 31st deadline. our hope is we will not have to extend. reporter: and expanding the safe zone around the environment. the environment is changing rapidly. reporter: as the situation outside the airfield continues to deteriorate. a state department memo revealing that 150 unauthorized individuals rushed through the gates whenever they re opened. senior officials concerned over a possible attack on crowds from isis. the threat is real, acute, persistent and something we re focused on with every tool in our arsenal. reporter: there are at least several thousand americans stranded in afghanistan. the white house not ruling out sending additional forces to help. with the president seeking input from his military commanders on the possibility of more troops. in a 30 hour period this weekend, the u.s. military helped air lift 11,000 people from kabul.