US border patrol agents: part bloodhound, part police, part rescuer Operating in remote and inhospitable terrain miles from anywhere, the green-clad Border Patrol agents are on the frontlines of a wave of Central American migrants heading into the US that has prompted a crackdown by President Donald Trump. AFP journalists accompanied the Border Patrol for three days in Texas, documenting the routine of the agents tasked with guarding the frontier amid growing controversy over Trump's immigration policy.