He's such a fucking moron. He thought that the Archives, staffed by very smart librarians (ahem), wouldn't dig into seeing what was still missing.
This is the thing about sociopaths like Trump. Their bigotries and prejudices blind them to potential danger. They believe they're smarter than everyone else, and can't conceive of anyone else getting the upper hand over them.
@holon42 They're paranoid, but their ridiculous egos override that paranoia.