The Trump administration is moving fast along the southern border — bulldozing walls, roads, and other infrastructure through some of the United States' most spectacular and ecologically important landscapes. In Big Bend National Park, Texas, the administration just broke ground and may soon blast canyon walls and block public access to the Rio Grande. In Arizona, multiple wall projects threaten the Tohono O'odham Nation; critical migration corridors for wild cats and other species in the San Rafael Valley; and Quitobaquito Springs, a desert oasis in Organ Pipe Cactus National Monument home to critically endangered Sonoyta mud turtles and Quitobaquito pupfish. U.S. environmental and cultural-protection laws should safeguard the wild — but the Trump administration has waived many of them to limit environmental review, accountability, and public participation for its border-wall projects. Congress has the power to shut down this border-wall blitz. Tell your legislators to step in...