How does an offender handle a probation violation from another jurisdiction?

Regardless of whether he answers the warrant now or later, he will still need to return to Iowa and face the original judge who put him on probation. They call this a detainer, where the current holding facility releases the inmate to the jurisdiction where the warrant was written. The likely outcome will be after he finishes his sentence in Illinois, the sheriff or marshal will be waiting to transport him to Iowa to be heard on the violation, and possibly service time in Iowa, too.