I can assure you that Trump knows that New Mexico is a U.S. State! As such, his remark is not a "gaffe." Remarks such as this are coming from the same place in his psyche as, for example, his remark that he could, in plain sight, get away with shooting someone on Fifth Avenue, or his showing a map on which the weather service's hurricane path has been altered with a sharpy to show a threat to Alabama. Having a president with a serious personality disorder is extremely dangerous. The negative repercussions could be long lasting and difficult to overcome.