A Trump-era law used to restrict immigration is nearing its end despite GOP warnings of a looming crisis at the Southern border

Hundreds of asylum-seekers gather on the banks of the Rio Grande to enter the U.S. on Dec. 12, 2022. Jose Zamora/Anadolu Agency via Getty Images

A key component of the Trump administration’s anti-immigration policies is currently set to expire on Dec. 21, 2022.

Officially called Title 42 of the U.S. Code, the little-known law was established initially in 1944 to prevent the spread of influenza and allow authorities to bar entry to foreigners deemed to be at risk of spreading the disease.