It's not on camera and he claims he didn't do it. He said some disrespectful stuff about McCain in the past, but they also had a personal beef due to McCain dissing Trump publicly. I have to admit it seems like a rather strange thing to say out loud even for Trump, and it's a little suspicious that it surfaced right before the election. I'm not saying he definitely did or didn't say it, but my bullshit alarm is definitely whirring on this one.
No, he didn't say it. He has never denigrated a group of people in his whole life. There are thousands of hours of him on tape and not once has he ever attacked a group, or class of people.
He attacks INDIVIDUALS, and he does so without mercy, but he has never attacked a group of people.