NEW : Sierra Club says border waivers are unconstitutional . Homeland Security chief : Waivers will enable security projects to move forward . Environmental , land-management laws will be bypassed for U.S.-Mexico fence . Comment:
NEW : Sierra Club says border waivers are unconstitutional . Homeland Security chief : Waivers will enable security projects to move forward . Environmental , land-management laws will be bypassed for U.S.-Mexico fence . Michael Chertoff says Congress has given him the authority to bypass laws .