The buzz around Washington, D.C., is that Donald Trump well might dismiss Attorney General Jeff Sessions and then nominate someone to replace him who will ensure that special counsel Robert Mueller is sent packing.

What can go wrong with that notion? Try this: Let’s remember what happened when an earlier president fired a special prosecutor who was examining the details behind the Watergate break-in.

All hell broke loose, that’s what happened.

President Nixon ordered two attorneys general to fire Archibald Cox. Elliot Richardson and William Ruckelshaus quit rather than do the president’s bidding. The solicitor general, Robert Bork, stepped up and fired Cox.

It got a whole lot worse for Nixon. Allegations of obstruction of justice boiled to the surface. Then came the articles of impeachment approved by the House Judiciary Committee.

Donald Trump is miffed at Mueller’s investigation into the Russia collusion allegation. The AG, Session, recused himself from the probe. Why? Because he served as a key campaign adviser. He couldn’t investigate himself, so he backed away.

Deputy AG Rod Rosenstein appointed Mueller, who has proceeded with all due meticulousness in his search for what happened. Trump calls it a “rigged witch hunt,” which it isn’t.

If he fires Sessions and then gets a new AG confirmed — which is no sure thing if the midterm election turns out badly for Republicans — there well could be a serious elevation of impeachment talk against Trump.

Such talk began to boil seriously after Nixon got Cox canned.

History, therefore, well might be ready to repeat itself.