Reuters/Kevin Lamarque President Donald Trump made a long-expected visit to the Otay Mesa port of entry in San Diego, California, on Tuesday to visit eight prototypes of the wall he has promised to build along the US-Mexico border. Trump hasn't yet secured funding from Congress for the wall, but the prototypes were commissioned and unveiled last October nonetheless. Workers from six companies took a month to construct the prototypes designed to deter illegal entry of immigrants and drugs.