>> does that mean troops will stay behind august 31st if necessary? >> it depends on where we are and whether we can grant these numbers up to 5 to 7000 a day coming out. if that's the case, they will all be. out >> so americans should understand the troops may have to be there beyond august 31st? >> americans have to understand that we're gonna try to get it done before august 30. first >> but if we don't, the troops -- >> we will determine at the time who is left. >> and? >> and if our american force -- if american citizens left were gonna stay and get them all out. >> situation on the ground in afghanistan remain tense as the taliban now dig in and assert control over that country. our veteran chief foreign correspondent richard angle is in cabals for us tonight. >> the u.s. led evacuation today is finally moving quickly and smoothly from the military side of kabul airport.