The White House is only willing to permit aides to be interviewed in private, with no oath and no transcript. To which Congress says, OK, except for the lack of a transcript. As Sen. Arlen Specter (R-PA) argued on the Senate floor earlier this month, they need a transcript in order to hold aides to account for lying. It’s a crime to lie to investigators, but without a transcript, it becomes much more difficult to prosecute that crime.
This is a companion discussion topic for the original entry at https://talkingpointsmemo.com/?p=180506