A section of border wall separates Tijuana, Mexico, from San Diego, as seen from the U.S. in January. California has filed a lawsuit along with 15 other states, calling President Trump’s use of a national emergency declaration to redirect money toward border wall construction unconstitutional.

A section of border wall separates Tijuana, Mexico, from San Diego, as seen from the U.S. in January. California has filed a lawsuit along with 15 other states, calling President Trump's use of a national emergency declaration to redirect money toward border wall construction unconstitutional.

A section of border wall separates Tijuana, Mexico, from San Diego, as seen from the U.S. in January. California has filed a lawsuit along with 15 other states, calling President Trump’s use of a national emergency declaration to redirect money toward border wall construction unconstitutional.

A section of border wall separates Tijuana, Mexico, from San Diego, as seen from the U.S. in January. California has filed a lawsuit along with 15 other states, calling President Trump’s use of a national emergency declaration to redirect money toward border wall construction unconstitutional.