Mexican residents of a poor Tijuana slum in the shadow of eight prototypes of US 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.
Donald Trump examined eight different styles of walls on the US border with Mexico, prototypes for the barrier he promised to build to keep out illegal immigrants and drugs.
The Republican brought a tough message on immigration to California during his first visit as US president to the heavily Democratic state that has served as a base of resistance to many of his policies.
Standing beside the prototypes, as US border patrol agents rode nearby on horseback, Mr Trump discussed the merits of various designs with border officials, his chief of staff, John Kelly, and Homeland Security Secretary Kirstjen Nielsen.
"The border wall is truly our first line of defence," Mr Trump told reporters.
Mr Trump has asked the US Congress for $18 billion to build the structure, but the funding has become ensnared in controversy over a host of immigration restrictions he and Republicans have proposed.
On the other side of the border, in Tijuana, Mexico, residents laughed off the idea the monolithic slabs will stop desperate immigrants.
"The wall is just a waste of money. People will continue to cross, here, there, and everywhere," Salome Pacheco said.
“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.
During his visit, Mr Trump took aim at so-called "sanctuary cities" in California - local governments that refuse to cooperate with federal immigration officials seeking to deport illegal immigrants.
"Sanctuary cities are protecting a horrible group of people," he said, renewing his complaints Los Angeles, San Francisco and other major cities are providing protection for illegal immigrants who have committed crimes.
Last week, Mr Trump's Justice Department filed a lawsuit accusing California of violating the US Constitution and putting federal agents in danger by approving laws protecting illegal immigrants.
California Democratic Governor Jerry Brown signed a bill into law last October that prevents police from inquiring about immigration status and curtails law enforcement cooperation with immigration officers.
Mr Brown, who accuses the Trump administration of waging war on the country's most populous state, has said the law was crafted with input and support from California police.
Mr Trump also slammed Mr Brown for high state taxes, saying Mr Brown "has done a very poor job running California".
Ahead of the trip, an immigration official in Northern California resigned, accusing the Trump administration of making misleading statements about a four-day raid in February to arrest illegal immigrants in Oakland.
Attorney General Jeff Sessions said a public warning from Oakland's mayor helped more than 800 people evade arrest.
But James Schwab, who quit his job as regional spokesman for the US Immigration and Customs Enforcement department, said he believed the number was much lower.
"I quit because I didn't want to perpetuate misleading facts," he told the San Francisco Chronicle newspaper.
After his San Diego stop, Mr Trump will travel to Los Angeles to headline a political fundraiser in Beverly Hills.
A Republican Party official said the fundraiser would net $5 million for Mr Trump’s prospective 2020 re-election campaign and the Republican National Committee.