That was a Nazi technique - the "Big Lie". LBJ also used it, in a nomination election in Texas against Coke Stevenson he accused his opponent of being a socialist, which was not true, and just kept repeating it.
It's a scary concept, especially in this day and age of so much fake news. One need only to tune into Fox news and the flow is almost endless. Don'r forget to tune into "All The Presidents Lies" tomorrow.