A Pretext? Priest Excommunicated For Questioning Francis’ Legitimacy

Pope Paul IV declared that the election of a heretic is invalid, even if it takes place with the unanimous consent of the cardinals and is accepted by all. www.virgosacrata.com/cum-ex-apostolatus-officio.html
“Those capable of being validly elected are all who are not prohibited by divine law or by an invalidating ecclesiastical law… Those who are barred as incapable of being validly elected are all women, children who have not reached the age of reason; also, those afflicted with habitual insanity, the unbaptized, heretics, schismatics…” (Wernz-Vidal, Jus Canonicum 1:415)
Wernz-Vidal — Canon Law, 1943
“Through notorious and openly divulged heresy, the Roman Pontiff, should he fall into heresy, by that very fact (ipso facto) is deemed to be deprived of the power of jurisdiction even before any declaratory judgment by the Church… A Pope who falls into public heresy would cease ipso facto to be a member of the Church; therefore, he would also cease to be head of the Church.” And also: “A doubtful pope is no pope.”