goods of 20% coming into the u.s. to force mexicans to reimburse u.s. taxpayers for that wall. but just in the last hour, wolf, sean spicer called reporters back in and said that that tax is only one of a number of options under consideration at this point. it is just another example of how building a wall is easier said than done. just as president trump stepped off of his maiden voyage as commander in chief on air force one, he landed in his first diplomatic controversy. and for a change, all eyes weren't on his twitter feed, but on the tweets coming from mexican president, enrique pena nieto, who announced in blunt trump fashion, that he has informed the white house that he will not be attending a meeting scheduled next week with the new american president, a protest that president trump's planned for a massive new wall on the border. >> translator: mexico does not believe in walls. i have said time and again, mexico will not pay for any wall. >> reporter: mr. trump all but invited pena nieto to scrap the trip, tweeting, if mexico is