In the battle on the U.S.-Mexico border, the fight against illegal immigration often loses out to environmental laws that have blocked construction of parts of the "virtual fence" and that threaten to create places where agents can't easily track illegal immigrants.
Documents obtained by Rep. Rob Bishop and shared with The Washington Times show National Park Service staffers have tried to stop the U.S. Border Patrol from placing some towers associated with the virtual fence, known as the Secure Border Initiative or SBInet, on wilderness lands in parks along the border.
In a remarkably candid letter to members of Congress, Homeland Security Secretary Janet Napolitano said her department could have to delay pursuits of illegal immigrants while waiting for horses to be brought in so agents don't trample protected lands, and warns that illegal immigrants will increasingly make use of remote, protected areas to avoid being caught.
The documents also show the Interior Department has charged the Homeland Security Department $10 million over the past two years as a "mitigation" penalty to pay for damage to public lands that agencies say has been caused by Border Patrol agents chasing illegal immigrants.