You can always tell when a politician is lying, or doesn't really believe in their defense of the indefensible.

They talk too fast trying to keep there opponent from getting a word in, they talk too loud because they are trying to convince themselves that actually believe their argument, the break in or cutoff their opponent so their opponent cannot keep a coherent thought going forward, and they throw out tangential comments and criticisms to distract and obscure the intended argument.

Sounds just like Congressman Gaetz ( R ) of Florida in his interview with Chris Cuomo on CNN tonight. If lies caused noses to grow like Pinocchio. his nose would have beat him back to Florida after the interview by a time zone.