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US Customs and Border Protection agents participate in a training exercise at a vehicle entry point along the border with Mexico on November 5, 2018, in Hidalgo, Texas. - Around 4,800 US soldiers were deployed to the border with Mexico, the Pentagon announced, saying it could not give a price tag for the operation Democrats decry as political maneuvring from President Donald Trump. (Photo ANDREW CULLEN/AFP via Getty Images)