Watch the eyes, they tell the story. During that ISIS speech he had a very resentful look in his eyes. Not resentful toward his muslim friends, resentful that someone made him say those words.
Remembering Nixon, we the public didn’t know it at the time, but it was the Party bigwigs that went to him and told him it was over, resign or face a likely impeachment..
He did have an odd expression the whole time. First time he showed some gumption and it was directed at US.