An MSNBC reporter recently received a real world lesson in why President Trump's promised border wall is crucially important to stop illegal immigration along the U.S.-Mexico border.

A reporter covering prototypes of Trump's proposed border wall taking shape near San Diego, when the interview was interrupted by a group of "migrants" hopping over the existing fence.

"What happened?" the reporter shouted as a group of agents on horseback move in to nab the border jumpers. "The people are crossing!"

"Almost on cue, a group of asylum-seekers, migrants not from Mexico, jumped over the existing fence to turn themselves in to border agents on horseback," the reporter narrated.

"It's like, a small group of three people jumped over in the middle of the day," he told a border patrol agent he was interviewing. "There's a girl there in a pink backpack. Can you explain to me what's going on?"

The agent said it's just another day at work fighting the never-ending battle to secure the nation's southern border.

"This is the reality of every day border enforcement. The United States is still the draw, the ultimate draw, for people that have dire situations where they're at," the agent said.