presence of isis. let's get right to cnn's barbara starr. she's live barbara, the president called the security situation on the ground, quote, fragile. will the role of u.s. forces in afghanistan change at all? >> perhaps not, jake. as with afghanistan always it's all about preserving security and security is always the problem. as the taliban showed their biggest win in years, briefly taking over a city in northern afghanistan, an isis and al qaeda continue expanding their ranks across afghanistan, president obama says the situation is still too dangerous to cut the size of u.s. forces still fighting in the country's longest war. >> the bottom line is in key areas of the country the security situation is still very fragile. and in some places there's risk of deterioration. >> reporter: the administration had sought to end u.s. involvement in the 14-year war