Axelrod's tweet on Friday is in response to a former White House doctor who suggested that Christie is dangerously obese.

In an interview with CNN, Dr. Connie Mariano, a doctor for then-President Clinton, said she was "worried about this man dying in office." In response, Christie said that Mariano should come and examine him before she comments on his weight.

"If she wants to get on a  plane and come here to New Jersey and asks me if she wants to examine me and review my medical history, I'll have a conversation with her about that. Until that time she should shut up," Christie said according to ABC News.