It would not surprise me at all

Mexican drug traffickers help Islamic terrorists stationed in Mexico cross into the United States to explore targets for future attacks, according to information forwarded to Judicial Watch by a high-ranking Homeland Security official in a border state. Among the jihadists that travel back and forth through the porous southern border is a Kuwaiti named Shaykh Mahmood Omar Khabir, an ISIS operative who lives in the Mexican state of Chihuahua not far from El Paso, Texas. Khabir trained hundreds of Al Qaeda fighters in Pakistan, Afghanistan and Yemen and has lived in Mexico for more than a year, according to information provided by JW’s government source.

Now Khabir trains thousands of men—mostly Syrians and Yemenis—to fight in an ISIS base situated in the Mexico-U.S. border region near Ciudad Juárez, the intelligence gathered by JW’s source reveals.
Sooner or later this shit, plus the others who've already snuck in through our 'Don't worry, it's secure!' southern border, are going to strike.  A lot of people are going to die.  And the chickenshit politicians behind doing nothing on the border will blame everyone except themselves.

And will insist this proves we need more anti-gun-ownership laws, don't doubt it.