How many troops are remainng after Bush left office, then what?
I'm not sure what the numbers were when Bush left office, but I'm sure it's information available if we were to look for it. The thing is, the number is irrelevant to the point. The fact is, the agreement for our withdrawal was negotiated under President Bush. It was not COMPLETED until Obama was in office, but it was still negotiated under Bush. As the deadline approached, the Iraqis expressed that they were not ready to take over security in their country (after all that time, they well should have been, but they became entirely too dependent on our forces to do it for them). President Obama tried to negotiate an extension, but the Iraqis were unwilling to allow us to stay under the same terms they'd agreed to before - with an immunity for our personnel from prosecution under Iraqi civil authority. So, with that refusal, the Obama administration continued with the withdrawal. Responsibility for Iraq not being able to defend itself falls exclusively with Iraq - first, because after all that time, they should have been able to put together an Army that wouldn't drop their guns and run the moment someone says "BOO!" in their general direction, and second because they COULD have had us staying on to help them if they hadn't insisted on being able to arrest and jail American servicemen.