This is BS. We could stay there 500 years and we would never be able to "put pressure" on Shia and Sunnis to work together.
This is just more pie-in-the-sky gobbledygook speak.
Whenever we left Iraq it was going to fall apart. Whether that was under Obama or anyone else. Same thing happened in Egypt. Same thing happened in Libya when their dictators fell.
These people cannot get along. Period. They've been fighting each other and chopping off heads for over 600 years.
It is not our fault they are like this.
And that is the 100%, unadulterated truth! For the West to try to sort these people out would be like the Saudis trying to sort out the Northern Ireland conflict. Not just a wasted effort, but greatly resented as well.