One Biden White House source told The Post they suspect that a key aide to the then-president may have made unilateral determinations on what to auto-sign. The Post is not publishing that staffer's name due to the lack of concrete evidence and refutations by other colleagues.

The Biden aide, who did not respond to requests for comment, would frequently make mention of what "the boss" wanted, the source said, but compatriots would have "no idea" if it was true because the internal culture was to not ask questions.

While the New York Post didn’t name the staffer, speculation is swirling around Neera Tanden.

…whose resumé includes positions as Center for American Progress president and aide to Secretary of State Hillary Clinton, she was in line to become White House chief of staff had Mrs. Clinton been elected president…

A longtime left-wing operative, Tanden was Biden’s controversial pick to lead the Office of Management and Budget — until her nomination collapsed over a slew of hyper-partisan attacks on Republican lawmakers. She later found a role as White House Staff Secretary. Now, she finds herself at the center of this constitutional crisis.