This is addressed in TFA: (6) Neither Nancy Pelosi nor Robert Byrd actually resigned their seats in the Congress. Thus, neither of them qualified to become Act

This is addressed in TFA: (6) Neither Nancy Pelosi nor Robert Byrd actually resigned their seats in the Congress. Thus, neither of them qualified to become Acting President under the Presidential Succession Act. Plus, interbranch appointments might be unconstitutional anyhow. See Akhil Reed Amar and Vikram David Amar, Is the Presidential Succession Law Constitutional?, 48 Stan. L. Rev. 113 (1995); but see Howard Wasserman, Structural Principles and Presidential Succession, 90 Ky. L.J. 345 (2002). furthermore, to the parent comment: I suppose the obvious counterargument is that Secretary Rice also never took the Oath prescribed in Art. II, Sec. 1, cl. 8, and thus was no more qualified than Barack Obama or Joe Biden to act as President at 12:00 noon. But if Secretary Rice was not President from noon to 12:01, then who was? Verdict: today is an interesting meatspace reminder to check your edge cases.