In this photo, Robert Mueller is displaying a classic nonverbal signal (MAP [Manipulator, Adaptor, Pacifier]). More specifically, this is known as the "Double-L" (because of the two Ls [right angles] made by the Index finger and the Middle finger - and a second one by the Index finger and Thumb). The thumb is resting on the inferior aspect of his mandible (jaw) - with the Index Finger resting on the zygomatic arch (cheekbone) - and the middle finger is over his lips (or on occasion, in the "mustache area").
The Double-L is strongly indicative of critical evaluation. It's helpful to think of this as projecting the colloquial thought-emotion of: "I'm not buying what you're selling".
As mentioned above, the middle finger can be positioned either in the "mustache area" (beneath the nose/above the upper lip) - or over the lips. When it's placed over the mouth, it sends the additional message of "Be Quiet"/"Stop Talking"/"Shut up".
The entire width of Robert Mueller's forehead is contracted and elevated. Although not a required component of the Double-L cluster, this dynamic amplifies his thought-feelings of disbelief.
Not to be overlooked, is another detail in the Special Prosecutor's mid-face. The second image captures this area in a close-up. Notice how his mustache area is tightened/contracted - as well as his nostrils which are flared. These expression ingredients project the additional emotion of Disgust.
Summary: The Double-L signals the alpha/hyper-alpha emotions of critical evaluation combined with deep disbelief. In this example, the elevation of his entire forehead width telegraphs Robert Mueller's amplified level of disbelief. Moreover, he also feels significant disgust for the object of his attention - who he very much wants to stop talking.
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