If you're in the Pittsburgh area, the Vatican's representative to the U.N. will be speaking at Duquesne University on Thursday Sep. 21. You need to register, details here.

If you get to ask a question, ask him to indicate whether the Holy See supports illegal immigration to the U.S. and/or ask them to provide the biblical basis for that support.

If things go well, ask him to renounce Cardinal Roger Mahony's support for massive illegal immigration. Or, at least ask him whether what he supports is really "humanitarian", or whether he's just making a bad situation far worse.

You could ask him whether encouraging illegal immigration leads to border deaths, pointing out that the only way to reduce such tragedies is to either completely open the borders, or discourage illegal immigration. Since we're never going to do the first, aren't Mahoney and the other U.S. Bishops encouraging people to cross?

Make your customized talking points starting with these entries:

"Illegal Immigration, the Catholic Bishops, and the Misuse of Scripture"
Bishops urge: show false, idiotic compassion to illegal aliens
Sensenbrenner to Catholic Bishops: please stop lying
The Catholic Church's anti-HR4437 smokescreen (no soup kitchens here)
"Cardinal Errors" (National Review on Roger Mahoney)
Don't blame the Vatican for the socialistic views of the U.S. Catholic Bishops

If all those fail, try this:

Should Cardinal Roger Mahony cost the Catholic Church tax-exempt status?