President Donald Trump pledged to build a 30-foot-high wall along the U.S. - Mexico border with a price tag of somewhere between $12 billion and $70 billion.

A Caltrans caution sign emblazoned with the image of an immigrant father, mother and child running for their lives along Interstate 5 in San Diego, Calif.

A Mennonite family plays at the beach along the U.S.-Mexico border in Tijuana, Baja California.

Hector Barajas, 40, third from the left, director and founder, Deported Veterans Support House, attends a church service at La Plaza de Faro in Playas Tijuana.

Eduardo Oleos, U.S. Border Patrol agent, apprehends a Mexican male, of Guerrero, Mexico trying to climb the secondary fence.

A Mexican male is questioned by Eduardo Oleos, U.S. Border Patrol agent, while trying to climb the secondary fence from Tijuana into San Diego.

The U.S.-Mexico border is equipped with stadium lighting and video surveillance along the Tijuana to Ensenada highway. Fed.

A member of the U.S. Border Patrol San Diego Sector tunnel entry team, inside the Galvez Tunnel along the U.S.-Mexico border in San Diego, California.

Mauro Mejia Torres, 63, of Nayarit, Mexico, peers through the fence from La Plaza de Faro, at the beach in Tijuana, to visit with his son Ricardo Mejia, 44, right, of Riverside, who he has not seen for 25 years.

The primary pedestrian fence, shown from Border Field State Park, San Diego, separates Playas de Tijuana and San Diego.
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