By Lizbeth Diaz and Delphine Schrank

TIJUANA, Mexico (Reuters) - Mexican residents of a poor Tijuana slum in the shadow of eight prototypes of U.S. President Donald Trump's planned border wall called the project a waste of money and laughed at the idea the monolithic slabs will stop desperate immigrants.

Several locals called Trump "loco" for thinking that spending billions of dollars on barriers would stop people determined to escape poverty and violence in Mexico and Central America. Trump made his first visit to California as president on Tuesday. His stop in San Diego to visit the prototypes was greeted by demonstrators on both sides of the border.

In the scrappy Rancho Escondido neighborhood on the Mexican side, protesters shouted over the line "we won't pay for your wall," in reference to Trump's insistence that the structure should be financed by Mexico.

U.S. soldiers, some with binoculars, focused back across the border, standing atop trailers placed ahead of the visit that blocked the view of Trump from the south for both protesters and local residents.

"The size of these walls is not going to matter," said Rogelio Perez, 48, who lives in the trash-strewn sprawl of cinderblock homes and makeshift huts grouped around a lot for abandoned cars, in sight of the 30-foot (9 meter)-high concrete and steel models.

"I even think they'll try to cross with those pole vaults that they use in the Olympics," he said as he awaited Trump's visit.

The prototypes, designed by six U.S.-based companies and unveiled last October, stand a few feet apart on the eastern edge of San Diego, several hundred feet from the rusty, stunted existing fence, part of a patchwork barrier that winds along the 1,954-mile frontier between the United States and Mexico.

Trump has sought $18 billion in funding to build the wall over the next two years. Magda Palacios, 56, joked that investing that money south of the border would be more effective at stopping the flow of people into the United States.

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"It would be better, instead of putting up fences, to send us the checks," she said, flinging scrap metal into buckets in the yard of a house she made from salvaged junk.

Beyond the jokes, there was an undertone of sadness and anger among some locals, who said Central American and Mexican immigrants offered more to the United States than they take. They expressed dismay that Trump viewed them as a danger.

"I don't understand how in this day and age they are doing this," said Perez. "The Berlin Wall came down, and here it seems that they are building it again."

Others in the neighborhood, a popular crossing point for border jumpers, examined the prototypes for weaknesses in designs that include an underground foundation to make tunneling harder.

One eight-year old girl pointed without hesitation to a steel-like structure capped in a narrow brown cylinder, saying Trump should pick that model, because it would be the least likely to stop an immigrant.

"The coffee-colored one," she said. "It's the easiest to throw an anchor up and pull yourself over."

Her mother, Salome Pacheco, said migrants would find ways to tunnel through, or resort to sea crossings to get into the United States.

"The wall is just a waste of money. People will continue to cross, here, there, and everywhere."

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(Editing by Frank Jack Daniel and David Gregorio)