The USA has been importing great numbers of them for several years. That’s just what’s visible. Plus thousands more enter due to our lack of any real immigration controls, just staying here after visitor or student or work visas, and our infamous unguarded borders. The enemy has very top lev agents in our govt too.
Iran has had its grubby little hands involved in Latin America for years... I should know I monitored terrorist organizations operating in Central and South America for US Army South (USARSO) back in the day. Iranian backed Hezbollah terrorists bombed the Argentine Israelite Mutual Association (AMIA) building in Buenos Aires in 1994.
Conveniently, the next day a Alas Chiricanas flight out of Colon City mysteriously exploded in midair from a bomb carried on the plane by one of the passengers. Over half of the passengers were Jewish... I’m sure the had absolutely nothing to do with the attack (sarcasm).