Trump spoke into the camera to tell people who harass Muslims to "Stop it!" He said it during an interview for "60 Minutes" with Lesley Stahl on November 13, 2016.
The CBS news transcript says:
"Lesley Stahl: Do you want to say anything to those people?
Donald Trump: I would say don't do it, that's terrible, 'cause I'm gonna bring this country together.
 Lesley Stahl: They're harassing Latinos, Muslims--
Donald Trump: I am so saddened to hear that. And I say, "Stop it." If it-- if it helps. I will say this, and I will say right to the cameras: Stop it."
http://www.cbsnews.com/news/60-minutes-donald-trump-family-melania-ivanka-lesley-stahl/