This is 99% invisible.

I'm Roman Mars.

You're going to build a wall.

It's going to be a real wall.

See that ceiling up there?

I mean, this is a wall that if you get up there, you're not coming down very easy.

True. up that you're not coming down very easy. It's true.

True.

We have.

One week into his presidency,

Donald Trump signed an executive order to begin building a wall between the

U.S. and Mexico. Trump says it will be quote an impenetrable physical, tall, powerful,

beautiful southern border wall.

But campaign slogans are easy.

Reality is harder.

That's Joe Richmond from Radio Diaries.

And on this episode, with the help of Radio Diaries,

we're going to tell a few stories about the physical border on the southern edge of the United States.

And what happens when instead of people crossing the border, the border crosses the people?

Joe Richmond, we'll take it from here.

In 2006, President Bush signed a law to begin building an 18 foot high fence, along few key parts of the US-Mexico border.

The project went by different names, Operation Gatekeeper in California, Operation Safeguard

...