u.s. in the fight against isis. turkey considers them both terrorists. lawmakers on both sides of the aisle, including some of the president's staunchest supporters are denouncing the dramatic policy shift and warning of an isis resurgence. and with air strikes already under way, it is too late to reverse course. joining me now, nbc news foreign correspondent matt burt bradley. and matt, can you tell us what's happening there on the ground? >> well, the latest, katy, you mentioned that the air strikes were already happening, it's too late to reverse it, well, it's too late to stop the ground incursion that just started. we're learn iing there's now turkish forces who are streaming into syria and alongside them are syrian forces that are actually backed by the turks, you know, sunni muslims who have long enjoyed support from the turks, and they're moving in, as