In Donald Trump’s universe, aka his mind, there is no doubt that his “Great Border Wall” will keep out all “bad hombres” from the U.S.—at least at the southern border. And there’s no convincing his die-hard fans, aka the dummies who voted for him because they want to shut out Brown and Black immigrants, otherwise.

But here’s a newsflash, Donald. At least one bad hombre—El Chapo—is in the U.S., and there’s no getting rid of him anytime soon.

And yes, we all know you were not kidding about your big beautiful wall dream. You reminded us of this Jan. 25, when you signed your executive order telling officials to begin to “plan, design and construct a physical wall” along the 3,200-kilometer (2,000-mile) U.S.-Mexico border.

You reminded us again Feb. 8, when you stated at a conference of county sheriffs at the White House, “The wall is getting designed right now. A lot of people say, ‘Oh, oh, Trump was only kidding with the wall.’ I wasn’t kidding. I don’t kid. I don’t kid.”

And you harped on it again Saturday, Feb. 11, when you rudely took time out from hosting the Japanese prime minister to tweet, “I am reading that the great border WALL will cost more than the government originally thought, but I have not gotten involved in … the design or negotiations yet.” You wrote in a second tweet, “When I do, just like with the F-35 Fighter Jet or the Air Force One Program, price will come WAY DOWN!”

We get it! But Donald, here’s a bit of advice. Not that you will take it, but here goes anyway. Before your waste time and tax payer dollars on design and construction, please, please talk to El Chapo.

Before you waste $21 billion of our money—much of it paid in taxes by the immigrants you despise—and saddle us with an eye sore that will keep no one out, please have a chat with El Chapo.

El Chapo and his friends in the Sinaloa Cartel know all about getting out of walls, over walls and under walls. In fact, just in December, Mexican police discovered two new tunnels that officials believed drug traffickers used to sneak from the border city of Tijuana into the U.S. One of them reached San Diego.

It was only the latest tunnel found since 2006. One of the longest cross-border drugs-smuggling tunnels between Mexico and the U.S. was found by authorities in San Diego in April 2016. The 800-meter (874-yard) tunnel was used to transport an “unprecedented cache” of cocaine and marijuana and was the 13th sophisticated secret tunnel found along California’s border with Mexico since 2006.

And since 2001, U.S. law enforcement has discovered more than 100 tunnels along the border with Mexico.

El Chapo himself has told you what he thinks of your wall. Last year, before his extradition to the U.S., El Chapo took to Twitter, the communication tool you so love, to reassure Mexicans that they shouldn’t worry about your infamous pledge to build a border wall.

“The wall is no problem,” he wrote last year. “I’ll knock it down, I’ll jump over it or I’ll go under it.”

That’s the reality Donald. You would do well to listen. Because those “bad hombres” are simply singing, “El Trumpeto, Great Wall, No Problem!”

The writer is CMO at Hard Beat Communications, Inc., which owns the brands: NewsAmericasNow, CaribPRWire and InvestCaribbeanNow.