At the busy San Ysidro border crossing between the United States and Mexico, it’s hard to find anyone with positive words about President Donald Trump’s vow to build a wall between the two countries. Holding true to his campaign promise, the Republican billionaire ordered US officials this week to begin constructing a barrier along the 2,000-mile (3,200-kilometer) US-Mexico border to keep out illegal immigrants.

He also announced other plans he said would strengthen security, including deporting criminal undocumented migrants. Here at the border crossing that connects the US city of San Ysidro with the Mexican city of Tijuana — the world’s busiest border crossing — an imposing physical barrier already stands tall. READ MORE