I think his main issue during that speech is that he's sulking. His tone and body language were just so "why is this happening to me?"

Surely he would've been notified that the Dems were going to launch the inquiry before it was officially announced? I mean the press ran articles that it was going to happen too. He even called Pelosi to try to 'work something out'. The art of the deal indeed.
The sniffing is weird though. Consistent, but weird. There have been many rumours about Trump being addicted to prescription drugs over the years. Surely someone at the WH would be able to get some evidence? Just speculating here, but if Trump has regular appointments with a doctor, either at the WH or Mar-a-Lago, would anyone else need to be present?