to President Nicolás Maduro.

We're on the Colombian side of the border with Venezuela.

We came here to see if the fight to push across U.S. aid

will break Maduro's hold on power.

But so far, the confrontation has led to this:

tear gas, hundreds of injuries,

and the trucks with the aid eventually turning back.

It was a very different scene along the border

the day before.

This bridge has been barricaded by Maduro

to keep our donated food and medical supplies, which

he sees as a ploy to undermine his government.

[music]

On this day, the bridge turned into the stage

for a star-studded concert

[singing]

energizing Venezuelans with pop music

and rallying support for the opposition.

[cheering]

At times, it felt removed from the reality inside Venezuela

and we wondered if a show like this

could really play any part in bringing political change.

We spoke with billionaire Richard Branson, one

of the event's organizers.

We film from up here.

We're both in sweaty t-shirts.

“We're going to have a wonderful concert today.

Hopefully, it'll be a dawn of a new era.”

Do you believe that?

Do you believe that it can be —

that can be achieved?

“I'm really hopeful.

I think anybody who's in a position to help

should help.”

Is this just a media spectacle?

“Go and talk to the people in the audience,

who are predominantly Venezuelans,

and you'll realize that it's anything but that.”

[music]

[music]

“Imagine there's no country.

It isn't hard to do.

Nothing to kill or die for — “

It's the day that the opposition

will try to force the aid across the border.

And we're back where the concert ended hours before.

[truck horn honking]

Juan Guaidó, the leader of the opposition, arrives.

He's been recognized as Venezuela's president

by more than 50 countries, including the United States.

Everyone on the bridge is watching to see what will

happen when Guaidó tries to lead the trucks carrying

across the aid.

But the border is sealed.

On the other side, the Venezuelan armed forces,

essential to Maduro's power, do not budge.

And Guaidó's hope that they would step aside to let

the aid through is dashed.

Guaidó and the trucks never make it onto the bridge,

nor do these Venezuelans.

Colombian police keep them back to prevent clashes.

But on other bridges, violence does break out.

We tag along with Omar Lares, a former mayor

living in exile for opposing Maduro's government.

We see one of the trucks with aid burning

after protesters clashed with Venezuelan security forces.

At the end of the day, a couple of dozen soldiers

had defected.

But Maduro survived the challenge.

Guaidó is outside his country,

and it's unclear when he'll be able to return.

Now the stage is set for what could become a bloodier

conflict, as Venezuela's presidents

dig in their heels.

[sirens wailing]