Expulsion??? How about just handing them over to the school of the Americas with orders to get any information they can out of them and then repackage them as fertilizer?
OK, how's this? We storm the Iranian embassy, hold everyone inside hostage for years, give nightly press conferences stating our demands and calling Iran dirty names, and put teams of people to work reassembling all the shredded documents from the embassy trash cans...
...oh wait, that's already been done. Just not by us. Never mind.