I’m not understanding what he means by this. USEF oversees competitions as the national governing body of equestrian sports. As far as I know, their oversight doesn’t include what goes on at a home barn. If an outside law enforcement agency investigates Parra, files charges for horse related (not immigration/visa) crimes, brings him to trial, and he’s convicted, then USEF can step in and apply their rules with sanctions.
If he’s violated rules at horse shows, that’s USEF and FEI’s jurisdiction through their stewards, and if found guilty, they have their punishments.
Is Adam Steffen-Smienk saying that they are waiting for USEF to file a criminal complaint against Parra? Or they’re waiting for law enforcement to file first, so USEF can go ahead and take action.