Sued if you do or don’t. The story from Overlawyered:
In short, the hospital had the choice of risking a patient’s life and being sued for malpractice, or restricting the privileges of the surgeon and being sued for discrimination. (And we know that had a patient sued for malpractice, the hospital couldn’t possibly have defended itself by pointing to the requirements of the ADA and saying that it was forced to employ the surgeon.)