KEY POINTS
  • As President Donald Trump declares a national emergency to build a border wall, crossings at the U.S.-Mexico border are at their lowest levels in nearly 50 years.
  • There were 303,916 apprehensions along the southern border during the 2017 fiscal year, the lowest level since 1971.
  • The reality of immigration levels at the southern border calls into question Trump's justification for declaring a national emergency.
A U.S. border patrol agent on the U.S. and Mexico border near Sunland Park, New Mexico.

President Donald Trump on Friday declared a national emergency to build a border wall. Yet illegal crossings at the U.S.-Mexico border are at their lowest levels in nearly 50 years.

That reality calls into question Trump's justification for declaring a national emergency over the border, potentially setting up years of legal challenges.