“Not attributed to Jefferson until the 21st century. May be a loose paraphrasing of a passage from Declaration of Independence (1776): "But when a long train of abuses and usurpations, pursuing invariably the same Object evinces a design to reduce them under absolute Despotism, it is their right, it is their duty, to throw off such Government, and to provide new Guards for their future security.”

Source: Wikiquote