There have been no terror attacks in the US homeland linked to the Mexico border, but the idea of terrorists using the frontier to gain access to the US is not merely hypothetical.
For the past eight years there has been a running debate between conservatives and liberals over the potential threat of terrorists using the US-Mexico border to enter or attack America.
The Obama administration has largely played down the threat, while conservative critics have issued a steady drumbeat of warnings.
Although there have been no terror attacks in the American homeland linked to the US-Mexico border, the threat of terrorists using the border to gain access to the US is not merely hypothetical.
What follows are 10 examples from criminal cases that highlight the issue of terrorism and the US-Mexico border.