That was an "I'm here, don't worry about me, get busy and carry on with your serious business."
Absolutely. Any man happily married for a couple decades can read that nonverbal communication clearly.
Trump rdiscretely eaches his hand back toward his wife. That says hey, you know I got a butt load of crap going on, but I am thinking of you always.
She taps his fingers gently and withdraws her hand. That says: Thanks for thinking of me. I am doing great here. Take care of business.