This is the reason why Republicans knowingly lie for political gain, even if Goebbels didn't say it.

An image from AZ Quotes. A black-and-white headshot of Goebbels is on the left. “If you tell a lie long enough, it becomes the truth.” is printed in white on a black background with the name Joseph Goebbels written in a “cursive” script under it. Goebbels didn’t actually say it. Enjoy the irony.