A recently posted video is casting a spotlight on the child sex trafficking trade worldwide, with former special agent Tim Ballard going undercover to expose exactly how the deals are done.

Ballard, a former special agent with the Central Intelligence Agency and the Department of Homeland Security, founded the nonprofit Operation Underground Railroad to expose child sex trafficking, and a video posted to his Twitter and Instagram accounts on Thursday does exactly that.

“This is the hardest part to watch,” Ballard tweeted with the video. “This is the ugly truth. (Posting the bust tomorrow) #endhumantrafficking #ourrescue”

The footage, clipped from documentary movie The Abolitionists, features Ballard undercover in a foreign country, where he discussed the purchase of young teen girls for sex with a trafficker eager to cash in on their innocence.

The video features the trafficker confirming the ages of the girls during a conversation on the street, before a follow-up meeting at a café where he shared images of the teens available for sex at a future house party.

“I’m doing 13 to 15 years old,” the man said in the undercover video. “That’s what you’re looking for, right?”

At the café, a trafficker promised the girls would be minors, and shared pictures of some of the youngest.

“The boss is going to like her!” the man said, referring to a girl in a picture on his phone.

“How old is she?”  Ballard asked.

“Fifteen. He’s going to like her,” the trafficker said. “If he doesn’t, I’ll take her for myself!”

The man explained that he was arranging for more than a dozen girls, including many young girls, to attend a house party.

“Right now, I’m working on 18 girls,” the man said an undercover OUR agent.

“Of the girls we already have that are sure, how many of them are actually minors,” the agent asked.

“Seriously minors, I got nine that are minors,” the trafficker said.

“What are their ages?” Ballard asked.

“Between 13 and 16 years old. I got one that is 13 right now,” he said.

The video concludes with footage from the house party, where traffickers ultimately arrived with more than a dozen girls and negotiated their sale, which included a 14-year-old girl and an extra $1,000 per night charge for virgins.

Ballard posted the video late Thursday night and encouraged viewers to visit AbolitionistsMovement.com “to access the footage that tells the rest of this heart-wrenching yet inspiring story.”

The site features a trailer of the movie The Abolitionists, released in 2016.

In the years since, Ballard has continued his crusade against child sex trafficking, through undercover missions that have more than 2,800 victims and led to the arrest of more than 1,500 sex traffickers worldwide, according to OURRescue.org.

He’s also advocated on cable news programs in favor of President Trump’s U.S.-Mexico border wall as a means of cutting down on the sex trafficking trade in the U.S.