A group that conducts “non-partisan conservative research and fact-checking” is calling into question the claim that one of President Joe Biden’s nominees to the Board of Governors of the United States Postal Service is a true independent and has produced online evidence she is a Democrat.

Amber McReynolds’s nomination will be considered at a Senate Homeland Security and Governmental Affairs hearing on Thursday. Biden nominated McReynolds to serve as the only independent governor on the nine-member board, which would make her a crucial tiebreaker on the panel.