Why the hell hasn't Donald Trump just fired Jeff Sessions?

(CNN)President Donald Trump ran down Jeff Sessions in a Tuesday interview with Hill.TV in some of his most demeaning and personal language to date, insisting "I don't have an attorney general" and adding: "It's very sad."

Trump also noted that his long-running dissatisfaction with Sessions wasn't based solely in the AG's decision to recuse himself from the ongoing Justice Department probe into Russian interference in the 2016 election -- and began with his performance in the confirmation hearings. Said Trump:
"[Sessions] went through the nominating process and he did very poorly. I mean, he was mixed up and confused, and people that worked with him for, you know, a long time in the Senate were not nice to him, but he was giving very confusing answers. Answers that should have been easily answered. And that was a rough time for him."
    So. Trump a) says he doesn't have an Attorney General b) believes Sessions did "very poorly" in his confirmation hearings c) thinks Sessions was "mixed up and confused" and 4) sees the whole thing as just "very sad."
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    Check out the latest analysis from The Point with Chris Cillizza:

    There appears to be a very simple solution available to Trump here: He could fire Sessions. After all, Trump made his name and his fame on firing people -- at least on a reality TV show. And it's not as though Trump is averse to overhauling his senior advisers -- he's already parted ways with his first secretary of state, head of the EPA, Health and Human Services Secretary and Veterans Affairs chief (among many others) in his first 20 months in office.
    And yet, Trump just won't do it. He seems set on trying to shame Sessions out of office -- why would you stay in a job where your boss constantly insults you publicly? -- but won't pull the trigger on jettisoning Sessions himself.
    Why not? Here are a few theories:

    1) He's afraid of antagonizing Republican senators

    While there has been some slippage in the unified support that GOP senators have expressed for Sessions, he remains someone that his former colleagues like and want to see stay in the job. At the top of that list is Senate Majority Leader Mitch McConnell (R-Ky.). "I have total confidence in the attorney general," McConnell said earlier this month of Sessions. "I think he ought to stay exactly where he is." Trump needs the support of Senate Republicans on any number of issues -- most importantly (and front of mind) the confirmation of Brett Kavanaugh to the Supreme Court. Getting rid of Sessions looks like an unnecessary provocation.

    2) He's been told it would make him look guilty on Russia

    The biggest ongoing story in Washington -- and in the country -- is the probe being run by special counsel Robert Mueller. Since Sess