The border wall prevents passage by wildlife, like these javelina. 

SWEC signs letter opposing border wall expansion

The Southwest Environmental Center joined with civil rights, faith, indigenous and other conservation groups in sending a letter to members of the U.S. House of Representatives opposing expansion of the 650-mile border wall that already exists along the U.S. Mexico border, as called for by Trump's recent executive order.

As stated in the letter, "further construction of a border wall will harm the environment that border communities cherish and depend on. It will further hurt wildlife; destroy sensitive habitat for endangered species; damage the natural flow of floodwaters; lead to costly litigation with landowners, Native American communities, and other stakeholders; and threaten the economic, social, and cultural ties between the United States and Mexico."

Construction of additional border wall is expected to cost a staggering $21.6 billion, according to the Department of Homeland Security.

The groups urged representatives instead to support H.R. 837 (Build Bridges Not Walls Act), which prohibits the use of taxpayer funds to build the wall, and H.R. 739 (This Land is Our Land Act) which bars construction of wall on federal lands controlled by the Depts of Agriculture or Interior.

Read the full letter here.