Border wall prototypes a first small step on Trump campaign promise

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One of U.S. President Donald Trump's eight border wall prototypes is pictured along U.S.- Mexico border near San Diego, California, U.S., October 23, 2017.

The top of one of U.S. President Donald Trump's eight border wall prototypes is pictured along U.S.- Mexico border near San Diego, California, U.S., October 23, 2017.

Five of U.S. President Donald Trump's eight border wall prototypes are shown near completion along U.S.- Mexico border near San Diego, California, U.S., October 23, 2017.

Four of U.S. President Donald Trump's eight border wall prototypes are shown near completion along U.S.- Mexico border in San Diego, California, U.S., October 23, 2017.

A border patrol officer stands next to some of U.S. President Donald Trump's eight border wall prototypes as they near completion along U.S.- Mexico border in San Diego, California, U.S., October 23, 2017.

Towering over the current border wall , one of U.S. President Donald Trump's eight border wall prototypes is shown near completion along U.S.- Mexico border in San Diego, California, U.S., October 23, 2017.

One of U.S. President Donald Trump's eight border wall prototypes is pictured along U.S.- Mexico border near San Diego, California, U.S., October 23, 2017.

The tops of two of U.S. President Donald Trump's eight border wall prototypes are shown near completion along U.S.- Mexico border near San Diego, California, U.S., October 23, 2017.

San Diego sector U.S. Customs and Border Patrol deputy chief Roy Villareal speaks to the media during a tour of U.S. President Donald Trumps's eight border wall prototypes as they near completion along U.S.- Mexico border in San Diego, California, U.S., October 23, 2017.

Three of U.S. President Donald Trump's eight border wall prototypes are shown near completion along U.S.- Mexico border in San Diego, California, U.S., October 23, 2017.

The top of one of U.S. President Donald Trump's eight border wall prototypes is pictured along U.S.- Mexico border near San Diego, California, U.S., October 23, 2017.

Two of U.S. President Donald Trump's eight border wall prototypes are shown near completion along U.S.- Mexico border near San Diego, California, U.S., October 23, 2017.