https://www.theguardian.com/us-news/2018/nov/07/jeff-sessions-fired-us-attorney-general

This appears to be a move against the Muller investigation, since Trump has often complained about Session's recusing himself from the Russia probe. But we'll have to see how this plays out.
It's also unclear if the new acting attorney general will be in charge of the Muller investigation, since he hasn't been confirmed by the senate. Or if it's still the deputy AG, Rod Rosenstein. Usually the deputy AG would be elevated to acting AG, but Trump seems to have bypassed Rosenstein in this regard. 
It's possible Rosenstein may also be fired/forced to resign soon.

Earlier there were reports that Trump had been advised to not try to fire Muller until after the midterms. It was also said that Muller might issue a report to the DOJ around this time.
If Republicans kept controll of the house, they could bury Muller's report and make sure it didn't see the light of day. Now that Democrats took back the house however, it's a different story. They can make Muller's investigation public, and impeach the president if there's evidence of wrongdoing.
However, Democrats don't take control of the House until January.

Saturday Night Massacre Vol. 2 incoming?
It'll be interesting to see how this develops.

Also, Jeff Sessions was the first senator to endorse Trump, and he has carried out Trump's agenda more than anyone, aside from stopping the investigation into Trump's potential crimes.
I wonder how the GOP feel about this.

Fun fact:
Muller's investigation has actually made the country money, because as part of Manafort's plea deal, he forfeited real estate and cash estimated to be worth between $42 million and $46 million.

The next Attorney General should be.....Rudy !!!

Well, I'll give Trump one thing - it's certainly an effective distraction from the whole debate as to whether the mid-terms were a success or failure for his party. Though personally, I think he could probably have come up with a distraction that didn't bring back memories of the Saturday Night Massacre.

Not too surprising since the Trump administration has a higher turnover ratio then the average Walmart.

I guess he planned to fire him after the midterms a long time ago. But he thought it could be negative for the elections.

He may fire some more people and replace them with loyalists. He doesn't even try to hide that and the best time may be now because people won't talk much about it anymore in 2020.

He resigned. Wasn't exactly fired. Updated the title of the thread and also added who is temporary replacement for Sessions as well.

Yeah, that's a better way to phrase it. Though since he resigned at Trump's request, I want the topic title to reflect that, so I added that in.

Nice. Looks pretty good now.

The title is more accurate but still, when you resign based on someone else request, people would still consider that as getting fired.  Either way, this was rumored before the elections so looks like business as usual.  If the other rumor is true that Mueller has Trump Jr in his cross hairs then the time is now for Trump to make this move before stuff gets out of hand.

Yeah I've heard that rumor about Don Jr too but nothing has come out of it thus far.  This is the strategy I see unfolding with Whitaker now at the helm. You're going to see decreased funding for the Mueller probe which will hinder him from doing his job properly. Investigation will not be stopped by will be so drained of money that even when its on going it will still seem like its stopped.

That's my guess as to what will transpire