Yesterday, President Trump signed the Tax Bill into Law in an impromptu ceremony in the Oval Office.
You'll note, during the video above, the President exhibited much of the same behavior addressed in Thursday's analysis - excessive motion of his hands and compensatory mechanisms - such as prolonged arm crossing in the attempt to suppress these movements (Please see: Body Language Analysis No.4156: President Trump's Cabinet Meeting - Crossing Arms and Excessive Motion).
A variation of Arm Crossing is the Double-Arm Grip. The President displays this most notably from 6:00 to 8:16. While less extreme in its beta emotional tone than arm crossing, it too is significant for defensiveness, emotional discomfort, and low confidence.
Despite his verbal language, Donald Trump's nonverbal behavior is guarded. No confident person grips each forearm in this manner. Try sitting at your own desk, while first talking and gesturing with your arms apart, palms-up. Next, speak the same words while gripping each forearm. Contrast how you feel in each position.
This forearm gripping is also yet another method to (partially) suppress excessive hand motion. Although primarily subconsciously controlled (with some edge-of-consciousness effect), in addition to the behavioral causes described above, this phenomenon is also another method to suppress and camouflage a drug side-effect and/or a medical movement/tremor/tremor-like disorder.
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Body Language Analysis No. 4154: Donald Trump's Two-Handed Drinking
Body Language Analysis No. 4152: Ruby Rose and her Mother's (Overgrown) Pig
Body Language Analysis No. 4150: Was Omarosa Fired or Did She Resign?
Body Language Analysis No. 4143: Billy Bush regarding Donald Trump on the "Access Hollywood Tape" (Stephen Colbert Interview)
Body Language Analysis No. 4136: Seminole Heights/Tampa Florida Serial Killer - Criminal Profiling
Body Language Analysis No. 4101: Myeshia Johnson, the widow of Sgt. La David Johnson - Interview on Good Morning America
Body Language Analysis No. 4035: Hope Hicks, Jared Kushner, and Phone Tells
Body Language Analysis No. 3953: Vladimir Putin and Emmanuel Macron meet in Versailles