Keep your eye on that staffer. I'm thinking her loyalty is suspect.
I've been wondering about Evelyn the staffer too. Walt has her scared spitless which could explain a few things. Besides the only person she can tell anything to would be Logan and she would have to be alone with him (not likely) and even then Logan is so hooked on Walt (Logan's brain I think) he probably wouldn't believe her anyway. If Logan goes back to Walt, he'll believe Walt and Evelyn is fired.
Yes, Evelyn, assistant to the FLOTUS. Not to be too much of a racial stereotyper, but I think she works for the Chinese.