1. Alvarez, P., & LeBlanc, P. (2020, January 9). Appeals Court allows use of $3.6 billion in military funds for the border wall. CNN. https://edition.cnn.com/2020/01/08/politics/appeals-court-trump-administration-border-funds/
2. American Civil Liberties Union (ACLU). (2021). Sierra Club v. Trump – Rio Grande Landowners Coalition brief in support of respondents. Retrieved October 23, 2021, from https://www.aclu.org/legal-document/sierra-club-v-trump-rio-grande-landowners-coalition-brief-support-respondents
3. Baker, P. (2019, February 15). Trump declares a national emergency, and provokes a constitutional clash. The New York Times. https://www.nytimes.com/2019/02/15/us/politics/national-emergency-trump.html
4. Barrágan, J. (2021, August 13). Texas to spend $25 million on 2-mile concrete barrier amid Gov. Greg Abbott’s push for a state-funded border wall. The Texas Tribune. https://www.texastribune.org/2021/08/13/texas-border-wall-greg-abbott/
5. BBC. (2019, January 10). US shutdown: Border politicians oppose Trump’s wall. BBC. https://www.bbc.com/news/world-us-canada-46815569