US military watch as crew workers add more concertina wire to reinforce the the border fence at Friendship Park on November 16, 2018 in San Diego, California. - The Central American migrant caravan trekking toward the United States converged on the US-Mexican border on November 15, 2018, after more than a month on the road, undeterred by President Donald Trump's deployment of thousands of American troops near the border. (Photo by Ariana DREHSLER / AFP)