From WashingtonPost -- “As a former prosecutor who was appointed by President George W. Bush on Sept. 10, 2001, I just want us to be really cautious, because this strain of libertarianism that’s going through both parties right now and making big headlines, I think, is a very dangerous thought."
Turns out Chris Christie is just another big-government neo-con who thinks the US has vital interests in the affairs of literally every nation on Earth. With the sentiment among traditional conservatives to stay out of the business of countries where we have no business, being nation wide, it is odd that Christie would attack libertarians since any GOP candidate will need their vote to get elected for the next few cycles at least.
All I can guess is that Christie has calculated that a if a republican gets elected, it'll be a neo-con like Bush and he needs to stake out a foreign policy position in the moderate part of the spectrum so that he can either get elected himself or get a plum administration position in any new administration. Either way, I have no use for Christie any more.