face-to-face meeting with president trump. white house correspondent hallie jackson reports. reporter: wall whiplash with the back and forth on the border wall and how to pay for it. who is going to pay for the wall? mexico! reporter: mexico says i won t, so the administration floating an idea to slap a 20% tax on mexican imports, a way to fund the $8 to $14 billion wall. turn urnd the plan, americans would play for more cars, fruits and vegetables and alcohol. in a fact, footing the bill themselves. that headline coming as president trump made his way back from philadelphia on his first trip on air force one. it s a great plan. reporter: in the back cabin, his press secretary sharing details. doing it that way, we can do $10 billion a year and easily pay for the wall. reporter: after two hours after landing, the