Biden’s rhetoric has also employed a de facto presumption of guilt. On a 2017 conference call with campus accusers’-rights activists, Biden offered a simple message to those who alleged that they had been sexually assaulted: “I believe you.” Proof for their claims, it seems, wasn’t necessary. The following year, during Supreme Court Justice Brett Kavanaugh’s nomination hearings, Biden suggested that women making high-profile allegations deserve an even greater presumption of truthfulness: “For a woman to come forward in the glaring lights of focus, nationally, you’ve got to start off with the presumption that at least the essence of what she’s talking about is real.”

https://www.city-journal.org/biden-campaign-due-process

In politics, a de facto leader of a country or region is one who has assumed authority, regardless of whether by lawful, constitutional, or legitimate means; very frequently, the term is reserved for those whose power is thought by some faction to be held by unlawful, unconstitutional, or otherwise illegitimate means