Tony Wayne, former Assistant Secretary of State for Economic and Business Affairs and US Ambassador to Mexico, pulls apart the strands.  First, what is an import?  How many times would you guess a raw material or auto part crosses a Canadian or Mexican border in the process of making and assembling a car?  4?  5? Each crossing carries a 25% tariff.  That’s a lot of crossings!  And a whole lot of tariffs!  And the point?  To make our neighbors tougher on smuggling into the US things we don’t want such as fentanyl.  But the drug trade runs two ways, depending largely on American-made guns that cross into Mexico.  All three countries must work together or everyone loses.  And what’s this about an external revenue service?