I suppose I had best interview each and every one of your staff
*considers this with some worry for a long moment before deciding you probably don't have a leg to stand on, since you're coming to this information so long after the fact*
But surely you've done that already, my lord? Or else how did you happen upon this...interesting information in the first place? Unless you make a habit of reviewing my House's surveillance footage? *pleasantly (but damned if that isn't an unsettling thought...but now he's just being paranoid, right?)* It was, of course, very patriotic of my staffer or staffers to come forward. I'll be sure to make a note in their permanent records. (Unless you do make a habit of reviewing my House's surveillance footage?)
*makes a mental note to get to the bottom of just how you know about all of this (paranoia or no)*