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Steel fencing. donald trump wants more. >> on day one, we will begin working on an inpenetrable, physical, tall, powerful, beautiful southern border wall. >> of course it can be done. >> reporter: professor michael dear is an author of the book "why walls don't work." >> a large concrete structure, 25 feet high, which would be very extensive in terms of resources and money. >> reporter: cnn has surveyed civil engineers, academics, and architects. the wall would most likely be made of precast cement panels, 20 feet wall, eight inches thick, requiring 339 million cubic feet of concrete. the pane...

Depends on mexican immigrants. >> all right. ed lev ender are dede levan dar now. . >> reporter: they've had a subdued response, the president of mexico sending an olive branch, saying he looks forward to working with president-elect trump. there hasn't been a lot of boisterous talk. you hear it on some lower levels, lawmakers who are warning the mexican government they need to be prepared to fight back against whatever donald trump does. one lawmaker said they would introduce legislation to make it illegal for mexican money to go toward paying for that wall. they insist if donald trump contin...

Wait to see the beginning of the border wall construction. >> that wall will get built and mexico is going to pay for that wall. >> i think he'll try to build a wall. i think he'll try to secure our borders. >> if people want to come into the country, they should do it legally. >> reporter: but in mexico, the idea of a wall is often shrugged off as a bump in the road north. jose torrez hernandez says he's illegally crossed into the u.s. many times to find work picking fruits and vegetables. he says a wall might make crossing over a little harder but immigrants like him would always find a way ...

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