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Several things. First, Obama and Hillary have huge, unwarranted, egos. I have little doubt that when Trump started making fun of both of them (e.g. Crooked Hillary, Lyin’ Hillary, Worst President Ever, etc.) they were likely seething inside. So, even when they weren't worried about him winning, they wanted to strike back at him. I don't remember when she said it, but Hillary at one point during the campaign commented on how Trump was going to ‘wind up in jail’.

So, that was when some of the opposition research etc. started. They wanted to hang something on him. How DARE someone from outside the amazing circle of ‘leaders’ they were a part of think he could be President, let alone feel he could get away with criticizing them. They probably felt it wouldn't be that hard to find something they could ramp up into a prosecutable crime.

Then, Trump continued to gain traction, and all of the predictions about him fading in the race turned out to be wrong. On top of this, the Wikileaks emails came out - showing just how crooked and manipulative the DNC and Clinton's associates were, AND Trump comes out and publicly jokes about the Russians finding Hillary's missing emails. So, now there's even more hatred by Hillary and probably Obama as well, coupled with some degree of fear/trepidation that their web of manipulations and deceit would be found out. This was made even worse when Trump started talking about draining the swamp. So they accelerated a plan for taking him down.