Walls are very important when you`re separating two urban areas where if you`re actually able to get over the border you can probably get into the underground network in about 30 seconds. But when you`re out in the middle of the desert, it makes no sense because you have border security people have up to a day to apprehend people who are crossing illegally.

The only thing I heard Speaker [Paul] Ryan say that made sense was, we actually really need to look at this and see what makes sense and what doesn`t, because electronic detection in those kind of - and drones and other types of border protecting devices seem to be much more effective in certain places.

Countries make policies for themselves. And Donald Trump wants to make - that`s his policy.

He [Donald Trump]wants to build the wall. It would be silly to say we`re going to - we`re going to create an army and we`re going to have Mexico pay for our border patrol, our border police. Clearly, that`s not going to happen.

I know that in the battle of ideas, Republican politicians are at a distinct disadvantage. Their fundamental philosophy - which I characterize as survival of the fittest, richest and whitest - is too callous for most Americans.

I was part of the gang of eight in the house in 2013 that was working on comprehensive immigration reform. We talked a lot about border security and what was effective and what was not. Walls are not effective when you`re out in the desert and you don`t need them.

If you destroy the credibility of those people or institutions that could undermine your own, you create an opportunity for your voice, however irresponsible or misleading it may be, to gain traction.