Beyond the candidates facing rejection, many others are simply stalled due to the extreme detail and depth of this new vetting. People are waiting for weeks while their social media accounts are looked at under a magnifying glass.
Nothing is moving, and nothing is getting done.
Trump nominated Mnuchin to lead the Treasury department back in November. Since then, there hasn't been much news to come out of the department. That this is in fact the first news to go mainstream will probably not please either of the two parties involved.
Then again, it has been mentioned before that those within the administration are aware that Trump exclusively watches cable news to get his information; their reported strategy to get anything accomplished is to leak it to the media in order to inspire action in Trump.
Perhaps this is what Mnuchin is going for? We'll have to wait and see.