Here's the statement from MSNBC president Phil Griffin:
"The tweet last night was outrageous and unacceptable. We immediately acknowledged that it was offensive and wrong, apologized, and deleted it. We have dismissed the person responsible for the tweet.
I personally apologize to Mr. Priebus and to everyone offended. At MSNBC we believe in passionate, strong debate about the issues and we invite voices from all sides to participate. That will never change."