A small but very revealing and significant shift is underway. The White House is no longer saying no US troops on the ground. Rather no US troops on the ground in a combat role, recognising the reality that some kind of rescue mission is going to happen and very quickly.
Obviously one option is a humanitarian corridor. I think more likely is some kind of massive airlift, simply because of the urgency of the situation and the judgement that many of the displaced people are too weak to walk, and that a corridor would be very difficult and problematic to try to secure.
Even an airlift would be challenging because clearly Islamic State militants would regard killing or capturing any US soldiers or airmen as a major propaganda coup. It is clear that even in terms of force protection, this could slip into a combat situation. For this President that would be a massive reversal, which is why tonight the White House is still saying no final decision has yet been made.
Kurdish Peshmerga fighters have emerged victorious in the battle for Mosul Dam, but the question is - what will their next move be?
An ITV News team at Mosul Dam was with victorious Kurdish Peshmerga fighters at the complex earlier today.
ITV News joined a Kurdish unit fighting Islamist militants near Irbil and found them using tanks from the 1950s and short on ammunition.