Trump administration begins building border wall in Big Bend region of Texas

The start of construction marks an important milestone in the administration's $46 billion plan to line the border with walls, barriers, roads and technology as it seeks to make good on a key campaign promise by Trump to finish the wall.

The start of construction marks an important milestone in the administration's $46 billion plan to line the border with walls, barriers, roads and technology as it seeks to make good on a key campaign promise by Trump to finish the wall.