Likely a timer so POTUS knows how long he's been on/has left.
Not unusual in most "speaking" places.
EU/Parliament etc.
Trump starts talking heavily about trafficking, Nancy finally stops her stress chewing–she's that nervous.
Keeps looking to her far left, too. Expecting something?
Nancy finishes reading, looks directly into camera and away.
Starts scratching left ear dramatically toward the far left she keeps peeking at throughout the night.
Her "angels" are on her upper right…