The Huff PO lies & Cheats
Here’s a better view of the incident. For some reason the protestor was going after the young girl. It may not even have been Corey who grabbed his collar, but her father trying to keep his daughter safe.
http://www.thegatewaypundit.com/2016/03/trump-campaign-manager-corey-lewandowski-prevents-assault-on-girl-at-tucson-rally/