It's known the Clinton campaign paid for a dossier from an organization known for fabricating false narratives and ruthlessly using the information to destroy credibility and positions. That, and it's known high ranking administrative officials in the FBI colluded to influence, and take part, in an investigation founded on the fake information from the dossier. That, and released classified information, while deliberately shutting down a criminal investigation of Hillary Clinton.
How far were they willing to go to stop a presidency? More lies? More efforts to corrupt justice? Maybe even assassination? We may never know, but if I was Trump, I wouldn't be cordial, or restrained. I'd be after my enemies, and ruthless with my actions. Some might not call this a coup, but I have a feeling there are many involved that had that as a contingency. A less polite society would have heads on a pole.