Can a Heretic Become Pope?

Siscoe and Salza posted a recent article in which they quote Father Cekada, inserting some of their own arguments:

“In April 2014, Robert Siscoe published an article entitled Bellarmine and Suarez on the Question of a Heretical Pope. Mr. Siscoe attempted to reconcile Bellarmine and Suarez’ teaching on loss of office for a Pope who became a public heretic.  And thus, so Mr. Siscoe thought, to refute the Sedevacantist position. The problem, as I pointed out in an article the following month, is that Sedevantists no longer believed [translation: “Because the argument has been refuted.”] that Bergoglio, Ratzinger, JP2 and the rest, ever became true popes in the first place. These men were public heretics, and canonists taught that as a matter of divine law, a public heretic could not be validly elected Pope. (…)  A year later I made similar points in my video “Stuck in a Rut.” Messers Salza and Sicoe, I said, were wasting their time refuting an argument that Sedes no longer made. [translation: “They refuted our arguments, so we “no longer” make them; we changed.] But they didn’t take the hint. So, smack dab in the middle of True or False Pope?, we find 6 chapters – 6 through 12 – nearly 250 pages, on loss of office.  Why did they insist on letting this Zombie argument mindlessly stumble and lurch around the graveyard?”

Actually the position that a heretica cannot become Pope was first advanced in 1982 by N. Martin Gwynne in Under the Laws of the Catholic Church, the Papacy Is Vacant.  John Daly joined Gwynne shortly after this and became a sede vacantist.  The book, Will the Catholic Church Survive the Twentieth Century” advanced the same proposition in 1990, which was soon adopted by many sede vacantists shortly thereafter.

Elsewhere I have addressed Cum Ex Apostolatus Officio.