The wall that President Trump has vowed to build along the U.S. border with Mexico could cost more than $21 billion, nearly twice the amount of previous estimates, according to an internal Homeland Security Department report that was obtained by Reuters. The $21.6 billion plan will be presented to Homeland Security Secretary John Kelly in the coming days, according to Reuters. The report details how the U.S. could build a barrier -- including both walls and fences -- along 1,250 miles of the border over the next three years. And the report said the first phase of construction would target the areas near San Diego, California, El Paso, Texas and the Rio Grande Valley in Texas. DHS officials assume in the report that Congress will approve funding for the wall in April or May, and Mexico would eventually reimburse the U.S., even though its leaders have been adamant about not financing the project.