TGG provided expert testimony on behalf of the Standing Rock Sioux and the Cheyenne River Sioux in the legal proceedings related to the controversial Dakota Access Pipeline (DAPL). Represented by Earthjustice, the Tribes have waged a long-term legal battle to stop the pipeline, in parallel with the historic protests of the pipeline in North Dakota. Since 2016, the Tribes have argued that the US Army Corps of Engineers (USACE) should deny DAPL permits to cross the Missouri River and undertake a full environmental review. In late 2016, the Obama administration supported the Tribes’ position, and USACE committed to a full environmental review. Days after his inauguration in January 2017, US President Donald Trump signed an executive memorandum to grant the final permits and expedite the construction process.