What is the White House afraid of?

Sidney Blumenthal at Salon has an idea and I rather like the way he put it.

In the U.S. attorney scandal, Alberto Gonzales gave orders, but he also took them -- from Karl Rove, who plotted to turn the federal criminal justice system into the Republican Holy Office of the Inquisition.

Rove is up to his eyeballs in this purge. The White House lied when it initially said they weren't even involved in the terminations, and lied again when they blamed Harriet. I would think that alone would be enough reason to compel immediate testimony under oath from the president's minister.

Update: Steve Benen runs down the reasons for oversight.