"Give us the names of your volunteers. Give us the names of your donors and your family members and your business associates. Give us the names of speakers and audience participants at your meetings."

McClintock said one person leading a group aimed at teaching about the Constitution was told to give names of students in the program to the IRS. In other cases, leaders of these groups were asked to look at a list of names and say what they know about people on the list.

"What I would like to know is why," McClintock said. "Why did the IRS demand lists of names of thousands of Americans, whose only common characteristic is that they disagree with this administration?

"Where are these lists now? With whom were they shared? Who wanted to know these names? What possible use would the IRS have to track the names of high school students who simply wanted to learn about their Constitution?

"But most importantly, what were these names used for, and what are they being used for?"

McClintock said he has no answers to these questions, but said Congress must find the answers in its ongoing investigation of the IRS.

That investigation was ongoing today, as the Senate Finance Committee was holding a hearing on the issue with Acting IRS Commissioner Steve Miller, who will resign from his post in early June.