trumpetard

portmanteau formed from trump + petard (in the sense of Shakespeare's "hoist with his own petard')

def: a linguistic "reveal" of pathological liars (like Trump), wherein a statement is "exploded" (revealed to be completely devoid of veracity) by an immediately following conflicting/contradictory statement.

example of usage: "In every public speech, the president careers from one trumpetard to the next!"