Donald Trump reportedly “believes” he has the legal authority to fire special counsel Robert Mueller.

A part of me wants to caution the president against doing something so patently stupid and political suicidal. Another part of me wants him to cut his own throat politically by firing the man hired by the Department of Justice to probe “the Russia thing.”

Indeed, several key Republican lawmakers are arguing against doing it. Sen. John Cornyn of Texas says it would be “a mistake”; Sen. Chuck Grassley of Iowa called it “suicide”; Senate Majority Leader Mitch McConnell of Kentucky said Mueller “should be allowed to finish his job.”

Will the president heed those words of wisdom? Does he ever listen to anyone with a semblance of common sense?

He might have the “legal authority” to act with profound stupidity. That doesn’t make it the right thing — or the smart thing — to do.

Mueller was appointed by Deputy Attorney General Rod Rosenstein because AG Jeff Sessions had recused himself over his connection to Trump’s campaign and his transition into the presidency. Mueller is supposed to determine whether the Trump campaign “colluded” with Russians who meddled in our 2016 election.

Trump calls the Mueller probe a “witch hunt.” He calls allegations “phony” and a product of “fake news.”

Good grief, Mr. President! If it’s phony, if there’s no “there” there, then let Mueller finish his job and issue a report that declares there’s nothing more to do.

Trump, though, insists on acting as if he’s got something to hide. A summary dismissal of Mueller — a former FBI director and a first-rate, meticulous lawyer — would send a signal all around the world that, yep, we’ve got a smoking gun out there … somewhere!

Wouldn’t it just stink of, oh, obstruction of justice?

As President Ronald Reagan once said — quoting another well-known Republican, Clint Eastwood — “Go ahead. Make my day.”