Adding, my only smidgen of question was why Hussein is outside the brackets. It left me a small question that someone else in the WH might have been on the phone.
But, I really think the meaning of Hussein and RR outside the brackets is that Hussein is the one who told RR about the call after the fact.
My thoughts are that a call was made from the WH to the tarmac (inside the brackets) Hussein and RR, being outside the brackets were on the call. Either participating or just listening or (my opinion) Hussein participating and RR listening as “legal counsel”.
Executive Privilege argument?