Your neighborhood scientist born and raised two hours away from the US Southern Border in Texas who is now on day 59 without pay.
(1) “Estimates of the Unauthorized Immigrant Population Residing in the United States: January 2015” from the Office of Immigration Statistics, the US Department of Homeland Security
(2) “Facts on U.S. Immigrants, 2016” from the Pew Research Center
(4) “U.S. Border Patrol Monthly Apprehensions (FY 2000 – FY 2017)” from the Stats and Summaries page of the U.S. Customs and Border Protection
(8) “U.S. Border Patrol Fiscal Year Staffing Statistics (FY 1992 – FY 2017)” from the Stats and Summaries page of the U.S. Customs and Border Protection