Hunter’s laptop, Hillary’s emails again, but it was mostly that Biden had some documents, too. Trump shouted that all presidents do this, and that what Biden had was worse, and his followers believed that without looking into any context (like all Biden had was some memos, copies of personal notes, etc, and that Biden immediately turned everything over and invited the feds to his home to look for more).

The scale was nowhere near the same, Biden hadn’t intentionally removed classified documents or tried to keep them from the feds, but none of that mattered. Trump saying he was entitled to the documents because everyone else did it was enough for his followers.