Perhaps a reason Hastert doesn’t want the FBI poking around in congressmen’s offices.

Speakers of the House, I’ve heard, have super-duper immunity under the Speech or Debate or Felony Clause.

UPDATE (5/26): I was on the road yesterday and unable to post. Hastert and the Justice Department are disputing the ABC story. ABC is sticking by its story. It seems the whole mess may turn on the phrase "in the mix." Hastert’s activities could be being looked at by the FBI without his being under investigation.