Dangerous Demagogues

How do you know he's lying?
His lips are moving

dem·a·gogue
/ˈdeməˌɡäɡ/
noun
noun: demagogue; plural noun: demagogues

a political leader who seeks support by appealing to the desires and prejudices of ordinary people rather than by using rational argument.
"a gifted demagogue with particular skill in manipulating the press"
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Similar:
rabble-rouser
political agitator
agitator
soapbox orator
firebrand
troublemaker
incendiary
tub-thumper
(in ancient Greece and Rome) a leader or orator who espoused the cause of the common people.

verbUS
verb: demagogue; 3rd person present: demagogues; past tense: demagogued; past participle: demagogued; gerund or present participle: demagoguing

rhetorically exploit (an issue) for political purposes in a way calculated to appeal to the desires and prejudices of ordinary people.
"he seems more interested in demagoguing the issue in media interviews than in dialogue"