There are many videos online showing the times that the news would only allow one-sided reporting. Many where a remote reporter has their connection dropped with suspicious timing. However, in this short clip, you will see the MSNBC anchor explain that they cut the feed on purpose, saying that “We have chosen to cut the sound”
She (or they) not only decided to cut an interview where Trump supporters where denouncing David Duke and calling for unity and expressing the need to end the racial divides. It appears ( since the anchor then commented on the man’s skin color) that because an African American was speaking in favor of unity that then felt the need to cut the segment.