(MSN) Gun-carrying civilian groups and border vigilantes have heard a call to arms in President Trump’s warnings about threats to American security posed by caravans of Central American migrants moving through Mexico. They’re packing coolers and tents, oiling rifles and tuning up aerial drones, with plans to form caravans of their own and trail American troops to the border.  “We’ll observe and report, and offer aid in any way we can,” said Shannon McGauley,

a bail bondsman in the Dallas suburbs who is president of the Texas Minutemen. McGauley said he was preparing to head for the Rio Grande in coming days. “We’ve proved ourselves before, and we’ll prove ourselves again,” he said. McGauley and others have been roused by the president’s call to restore order and defend the country against what Trump has called “an invasion,” as thousands of Central American migrants advance slowly through southern Mexico toward the U.S. border. READ MORE