President Joe Biden’s refusal to even attempt to secure the southern border is getting people killed, and it may just be breathing life into terrorist threats on U.S. soil as well.

The Department of Homeland Security has reportedly identified at least 400 illegal immigrants from Central Asia who have crossed the southern border by way of a human smuggling network affiliated with the Islamic State group. Just 150 of those 400 have been arrested, and DHS has lost track of more than 50 of them. This is on top of previous reports that Immigration and Customs Enforcement can’t keep up with the surge and has released into the country illegal immigrants who are on the FBI’s terrorist watchlist.