Bob Barr was a US Attorney appointed by President Reagan. Here is what he has to say:
The CNN news person interviewing Bob Barr asks "what about Democrats taking the offer, listening in to what is said between Karl Rove, Harriett Meyers, and whoever else is going to be testifying, and if they don't hear what they want to hear, if the questions are not answered, then moving forward and saying, we need an oath, and saying we need a transcript?"
This reporter clearly has not read the the White House letter sent to Congress. This letter states their conditions for testimony. The letter says that if the Administration officials testify, they cannot be recalled for further testimony. So not only will they not be under oath, but this is the only shot Congress has at them, no matter what they say.