This photo was captured immediately after Representative Devin Nunes' now very controversial meeting with President Trump at the White House on 22 March 2017. Afterward, in his statement to the press, Nunes, who is chairman of the United States House Permanent Select Committee on Intelligence, also revealed the existence of previously undisclosed FISA investigations. Many have noted that disclosing FISA's activities in such a manner is a violation of the law and antithetical to some of the basic principles for which FISA exists.
Thus within this context, Devin Nunes' facial expression in this moment is understandable. This nonverbal display is a classic example of an "Inward Lip Roll". As the name suggests, this facial configuration involves the lips are rolling inward, usually completely (momentarily with no view of the lips) and are gently to moderately "bit" by the upper and lower teeth. Sometimes abbreviated as ILR, the inward lip roll is a signal of the subconscious effort to suppress the growth of strong emotions - not only outwardly - visible for all to see, but also "inside" one's own psyche. The ILR can be thought of as a natural down-regulating mechanism.
Most of the time, the ILR is associated with the attempt at controlling what are thought of as traditionally "negative" emotions - such as anger, fear, frustration, disgust, sadness/tears, etc. Yet it's also seen during attempts to prevent "positive emotions", such as joy-laughter - the display of which (in the wrong settings) would have negative ramifications.
In our everyday interactions with others, we rarely have the benefit of such background information as we have here with Rep. Nunes. This is precisely why recognizing nonverbal signals as they occur in real-time is so very crucial - for people truly speak much more with their faces and bodies than they do with their words.
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