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Working in the country. whether that is realistic, is one question. how well do border fences work? tom foreman has been looking into that tonight. he joins us. how would donald trump's version of a brd eborder wall work, tom? >> it will start by being the biggest thing in the world we see like it in the modern world. this wall would be 2,000 miles long in its completed stage. already about 700 miles of the border have been covered by a fns fence of some sort. if we want to double that part. not finishing it. getting 700 miles. to do that and put all the security you need to make it work would...

Would only address a small portion of the immigration challenge. i think rather than, than putting all of our energy in this effort which would be a tremendous, require tremendous effort. i think it would be wiser to pursue a comprehensive legislative strategy that deals with major components of imgraegs i immigration reform, tougher work place enforcement. border security. putting those who are qualified. in this country that qualify, into some kind of temporary legal status. so i think that is a much better approach. makes much more sense than what mr. trump has outlined. >> when donald trum...

We have to come up with a realistic solution. the problem with biflding a wall of course. terribly expensive. if would not deal with the, estimated up to half the people here unlawfully today came to the country lawfully. if we built the 3,000 mile fence. you know it wouldn't, it wouldn't address the problem of visa overstayers. i do believe we need some kind. we need border fencing. but i think we can take advantage of natural terrain. rely on changing technology. to achieve greater border security. i don't think we need a 3,000 mile fence. thinking, proposing that mexico pay firt. -- pay for...

Arizona. they're challenging to go over, through, under. it happens all the time. they're not impenetrable. this is harder to pass than this. this much more commonly seen border fence along the mexico-u.s. frontier. railroad ties. 7-foot fence. barbed wire which you often see. barbed wire is easy to cut. if someone is motivated to go through the desert here in southeastern arizona where we are right now. they can easily get through. we will give you an idea of how easy it is to cut. not only does the barbed wire go on here. no fence. just the railroad ties. now i am in mexico. any body that wo...

The many, many years that illegal immigrants have been coming into the united states? >> no, i certainly ever saw any evidence of that when i worked in the white house there see any evidence of that at the justice department. i had multiple meetings and conversations with my mexican counterparts. had several visits to mexico. and so, i have not, i am not aware of any evidence of that. if mr. trump has evidence of that. i thin we would all be interested in seeing it. good talking to you. thank you. the attorney general talked about paying for the wall. i want to turn to the other concern, centr...