President Donald Trump is moving fast to spend billions of dollars to build a wall on the Mexican border with money secured under his declaration of a national emergency, but he first must get past the courts.

On Friday, a federal judge in Oakland, California, will consider arguments in two cases that seek to block the White House from spending Defense and Treasury Department money for wall construction. California and 19 other states brought one lawsuit; the Sierra Club and Southern Border Communities Coalition brought the other.

Next week, a federal judge in the nation's capital will consider a bid by the U.S. House of Representatives to prevent Trump from spending any Defense Department money for a border wall.

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Spagat reported from San Diego.