Trump’s first trip to California will involve him looking over the prototypes for the border wall.
The construction of a wall along the U.S.-Mexico border was a signature campaign promise of Trump’s. Since taking office, officials have at various times indicated the wall could include fencing in some portions.
Trump has made funding for the border wall a top demand in congressional negotiations to provide a fix to protect recipients of the Deferred Action for Childhood Arrivals (DACA) program
During the campaign, Trump repeatedly claimed Mexico would pay for the wall, but Mexico has refused to do so. That disagreement recently prompted Mexican President Enrique Peña Nieto to cancel his plans to visit the White House in the coming weeks.