It makes senses that President Bush is refusing to allow his advisers to testify under oath before Congress about the firing of eight federal prosecutors. President Bush knows that Vice President Dick Cheney's chief of staff was just convicted of lying under oath to the FBI.
If the White House advisers don't testify under oath, they can avoid perjury charges. Duh!
By coincidence, the firing of the U.S. attorney in San Diego, right after she issued search warrants against a recently indicted CIA official and a defense contractor, assures that former Congressman Randy "Duke" Cunningham will be the only government official sent to prison for having his hand in the taxpayers' cookie jar (bribery).
More convictions for perjury and corruption are the last things the Republican Party wants before the next election.