Every day, migrants seeking a better life in the United States travel across its southern border.

But what awaits them on the other side?

This is James Nocti, and you're listening to The Documentary from the BBC World Service.

This is heart and soul exploring personal experiences of spirituality and faith.

In the recent American presidential campaign,

immigration and what happens along the border was a centrepiece of Donald Trump's appeal.

He's promised to tighten border controls, reduce crossings,

and deport potentially millions of people. Well, in this program, we're putting aside the political

rhetoric and talking instead to people on the front line. During that election campaign, I travelled

to Tucson in Arizona, very close to the border,

and spent time there with people from the city who feel driven to protect migrants from harm.

Sunday morning, Sarah Roberts is in the congregation at Southside Presbyterian Church in Tucson.

I was moved by my faith, you know, to get involved. You know, Matthew 25 was one of the inspirational

scriptures.

Matthew 25 has to do with Jesus saying,

if you give water or food to the least of these, you're giving it to me.

And so it carries that message forward.

But not everybody are people of faith, right?

People of faith and conscience is how we say,

people that founded these movements.

We're 70 miles north of the border here and the famous wall, which although incomplete, snakes

across long parts of it. And this is one of the places where migrants arrive,

...