It's really great to have all the salient points/links posted in this thread! Thanks to all of you so devoted to keeping us all 'in the loop'.
DH heard on the radio that the person who wrote Trump's Art of the Deal believes that if it gets too hot that Trump will resign in a huff in the same way he's abandoned projects that weren't going his way. His motivation being setting them up to fail before he goes combined with his huge ego being unable to take the fact that the people he considers his 'minions' are actually daring to tell the truth/oppose him. In a way, I think I can see him being like that. The difference is that in this case he won't be able to basically 'slink away' relatively quietly (because his blown deals didn't really make much news) whilst telling lies and filing (or settling) lawsuits as he goes. This time he'd be shamed before the entire world because everyone would know that he was quitting to avoid being impeached (i.e. quitting in shame). I don't know if his ego will permit that or if it will force him to fight to the bitter end.
I think we're going to see many 'hatches being battened'. Information gathered by the Special Counsel's Office (SCO) will NOT be leaked. I think the SCO will likely be 'in touch' with other potential leak sources and will tell them to 'stifle it' so as not to jeopardize the investigation or tip off potential subjects suspects.
I think we're going to see Trump's 'minions' also retreat and pull up the drawbridge. That's why we're seeing interviews and pressers being cancelled and previously vocal people now saying 'no comment'. Whether or not they can keep the 'Tweeter-in-Chief' quiet is another thing. He's his own worst enemy. (Thank God!)