If I were Donald Trump’s chief of staff, I’d just break his thumbs.

That’s what Reince Priebus should do – and then maybe buy a roll of duct tape.

From Day One of his administration, President Trump has hurt himself and his agenda by doing a lot of stuff that is absolutely stupid.

Does anyone think it was Priebus who was telling Trump to fire FBI Director James Comey?

Or telling him, “While you’re at it, Mr. President, why don’t you undermine your staff and the VP of the United States for a second time.”

What the president desperately needs is an adult in the Oval Office who will stand up to him — and that he will listen to. Maybe it has to be Jared Kushner, because Trump can’t fire his son in law.

Otherwise it’s going to take someone on his staff with the highest authority – maybe Priebus – to stand up and publicly say, “Unless this chaos ends, Mr. President, I’m going to resign.”

Until something shocking like that happens to wake up President Trump, or until he is tied up and sedated by his staff, his administration will be constantly under siege from the left and the fake journalists in the media.

We all know why the liberal Democrats in Washington, Hollywood and the news media hate Trump.

They didn’t want him to be president. They all voted for Queen Hillary and since last November they’ve all been feeling somewhere between sad and suicidal.

So now you have them trying everything they can every day to get rid of President Trump.

But are they really so stupid that they don’t realize yet that even if Trump goes down they still aren’t going to get their President Hillary?

Do they realize they’re going to get President Mike – a savvy, competent, principled conservative who won’t shoot himself in both feet every day?

A President Pence who will be able to work with a Republican Congress to get all the things done that Trump promised but can’t deliver – tax reform, immigration reform, healthcare reform and more?

We know the attacks of the Hysterical Left will never stop until Trump is impeached or driven from office.

But despite the apoplectic editors at the New York Times and the Washington Post and the drooling leftwing anchors and pundits at MSNBC/CNN, President Trump has done nothing yet to be impeached for.

It won’t matter what James Comey says the president asked him to do regarding the FBI’s investigation into the alleged Russian-Trump collusion to prevent the coronation of Queen Hillary, for which there still is no evidence.

What Trump may or may not have said to Comey rises to the level of stupidity, but it doesn’t rise to the level of impeachment.

And the classified information Trump supposedly gave to the Russians in the White House about the fight against terrorists was no different from what President Obama gave to the Russians concerning the terrorists in Syria.

Remember when Rachel Maddow and the Washington Post editorial page went apoplectic after Obama divulged secrets to the Russkies? Neither do I.

President Trump has been, is and always will be the source of the chaos. He’s not in charge of a business anymore, he’s in charge of an administration.

If he keeps going down the crazy road he’s on with these stupid childish tweets and the statements he makes, Republicans will lose control of the House and Senate and any chance for tax reform, immigration reform and health care reform.

And then America isn’t going to be great again. It’s going to be bad again.

Michael Reagan is the son of President Ronald Reagan, a political consultant, and the author of “The New Reagan Revolution” (St. Martin’s Press). He is the founder of the email service reagan.com and president of The Reagan Legacy Foundation.