Roberts had an obligation not to swear the guy in. The electoral college had an obligation to make sure he was qualified. All the state and county voting offices had an obligation to check to make sure he was qualified to be on their ballot. Nancy Pelosi had an obligation not to certify him as the DNC’s candidate knowing he was not a citizen.
"3. If, at the time fixed for the beginning of the term of the President, the President elect shall have died, the Vice President elect shall become President. If a President shall not have been chosen before the time fixed for the beginning of his term, or if the President elect shall have failed to qualify, then the Vice President elect shall act as President until a President shall have qualified; and the Congress may by law provide for the case wherein neither a President elect nor a Vice President elect shall have qualified, declaring who shall then act as President, or the manner in which one who is to act shall be selected, and such person shall act accordingly until a President or Vice President shall have qualified."
Congress failed to uphold it's own duty to defend the office of President from being usurped. Traitors all.