Walters said via Breitbart:
I don’t know, I don’t. I think that, you know, unless you’re a little more familiar, you don’t even know the term mentally challenged….Do I think it was unfortunate that he did it? Yes, I do. Do I, do I think he realized what it was? No, I don’t.
So basically, she excuses him on the basis of ignorance and/or stupidity.
Goldberg also jumped in, but her I am not surprised about.