When your two presidents are having an open fight and cancelling appointments....Yes i'd say you are in a crisis.
Mexico is the most important asymetrical partner for the US. I think it is short-sighted to damage relations with the neighbour like that.
It's all short term thoughts from Trump, he has no clue to the consequences.
i'd like to bet that mexico gets buddy buddy with china but i would rather not find myself dressed as blackface bondage hitler chugging tabasco sauce...