Nevertheless, they're already proving politically useful for both Trump and his opponents. Organizers say the rally shows that San Diegans are united against the "wasteful, harmful and irresponsible" plan to build the wall. Jerry Brown is inviting President Donald Trump to come to California's Central Valley while he is in the state to view border wall prototypes this week.
But California has since acquired greater symbolic significance for Trump - and for his opponents.
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Pro-wall activists plan to stage a demonstration in support of Trump's visit near the Otay Mesa site on Tuesday morning.
Organizers on both sides were urging people to remain peaceful after recent scuffles at rallies in Southern California, including brawls at a December 9 rally near where the prototypes stand.
"In the call on February 20, (Peña Nieto) strongly reiterated what all Mexicans have always said: we will never pay, in any form, for a wall on theborder", Videgaray posted on Twitter.
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Trump on Tuesday is expected to be briefed on lessons learned from the construction of the prototypes built in San Diego last fall. A women's rights group, Women's Right San Diego, will also be there. Like many Republicans, Trump's main interest in California was financial: the state is home to many high-dollar conservative donors.
California is also where the Trump administration has erected the prototypes for its proposed border wall - and it is that site that will be the main focus of Trump's excursion to the Left Coast.
Last month, Peña Nieto canceled plans to visit Washington after another phone call with Trump during which the US president reportedly lost his temper.
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The wall-or what little of it now exists-is giving all of these groups a platform to get their message across. "Lots of local, state, and national media will be there including Fox News, CNN, Orange County Register, Desert Sun, Wall Street Journal, NPR, and many others".