It happened about 27 or so minutes into the speech:

As seen on TV: https://www.youtube.com/watch?v=SN3GNBYhSxg

From some dude's living room: https://www.youtube.com/watch?v=SYN-pkRVrK0

RT Ruptly clip: https://www.youtube.com/watch?v=CIAhnfew1js

From the floor of hall: https://www.youtube.com/watch?v=Wcks9SQp7s0

News of protesters no mention of Epstein or video included: http://thehill.com/homenews/administration/393386-trump-mocks-protester-at-rally-was-that-a-man-or-a-woman

RSBN Clip: https://youtu.be/UHzxrj21IqU?t=2h48m55s

You can kind of tell he saw it and it shook him more than the usual protesters. Hopefully more protesters get courage from this if it gets enough attention.

C-SPAN Clip: https://www.c-span.org/video/?c4736673/protester-disrupts-president-trumps-speech-duluth-mn-6202018

Decent Clip of it from Ruptly: https://youtu.be/CIAhnfew1js?t=40s

You could see it plain as day for a prolonged period on the Fox News Cable TV Network broadcast of it live. I was surprised.

Pictures here: http://www.dailymail.co.uk/news/article-5866937/Trump-hold-rally-state-LOST-fires-supporters-Minnesota.html