Trump caps California swing with visit to border wall

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U.S. President Donald Trump gestures during his visit to a section of the U.S.-Mexico border wall in Otay Mesa, California, U.S. September 18, 2019.

U.S. President Donald Trump visits a section of the U.S.-Mexico border wall in Otay Mesa, California, U.S. September 18, 2019.

The presidential motorcade travels along a section of the the U.S.-Mexico Border ahead of U.S. President Donald Trump's visit in Otay Mesa, California, September 18, 2019.

A general view shows Mexican security forces (L) keeping watch at the border fence between Mexico and the United States, ahead of the visit of U.S. President Donald Trump to a section of the border wall in Otay Mesa, California, as pictured from Tijuana, Mexico September 18, 2019.

U.S. President Donald Trump looks at materials used to construct the border barrier during a visit to a section of the U.S.-Mexico Border in Otay Mesa, California, on September 18, 2019.

A person uses a mobile device as U.S. President Donald Trump visits a section of the U.S.-Mexico border wall in Otay Mesa, California, U.S. September 18, 2019.

Microphones are seen near a section of the U.S.-Mexico border wall during U.S. President Donald Trump's visit, in Otay Mesa, California, U.S. September 18, 2019.

U.S. President Donald Trump holds up notes during his visit to a section of the U.S.-Mexico border wall in Otay Mesa, California, U.S. September 18, 2019.

U.S. President Donald Trump visits a section of the U.S.-Mexico border wall in Otay Mesa, California, U.S. September 18, 2019.

U.S. President Donald Trump signs his signature on the border wall while visiting a section of the U.S.-Mexico border wall in Otay Mesa, California, U.S. September 18, 2019.

United States Secret Service Agents scan the surrounding area of the international border during U.S. President Donald Trump's visit to a section of the U.S.-Mexico border wall in Otay Mesa, California, U.S. September 18, 2019.

U.S. President Donald Trump visits a section of the U.S.-Mexico border wall in Otay Mesa, California, U.S. September 18, 2019.

U.S. President Donald Trump visits the U.S.-Mexico Border in Otay Mesa, California, September 18, 2019.

U.S. Customs and Border Protection (CBP) agents are seen behind the border fence between Mexico and the United States, ahead of the visit of U.S. President Donald Trump to a section of the border wall in Otay Mesa, California, as pictured from Tijuana, Mexico September 18, 2019.

U.S. President Donald Trump visits a section of the U.S.-Mexico border wall in Otay Mesa, California, U.S. September 18, 2019.

An agent with the U.S. Border Patrol Tactical Unit (BORTAC) is seen behind the border fence between Mexico and the United States, ahead of the visit of U.S. President Donald Trump to a section of the border wall in Otay Mesa, California, as pictured from Tijuana, Mexico September 18, 2019.

U.S. President Donald Trump visits a section of the U.S.-Mexico border wall in Otay Mesa, California, U.S. September 18, 2019.

U.S. President Donald Trump looks at materials used to construct the border barrier during a visit to a section of the U.S.-Mexico Border in Otay Mesa, California, on September 18, 2019. REUTERS/Tom Brenner - RC186C5B67B0