Donald John Trump has compiled an endless list of broken campaign promises. I’ll take a glance briefly at just one of them.

He vowed to become more “presidential” once he took the oath of office. He hasn’t done so. He’s become even less presidential.

Consider his latest blockbuster tweet in which he declared that transgender service personnel no longer could serve their country. He is governing by Twitter. The tweet caught the Joint Chiefs of Staff, congressional committee leaders, the Department of Defense and military field commanders all by surprise.

The president fired off the tweet and then — bang! — ignited a firestorm.

This idiotic tweet has provided yet another glaring, glowing and ghastly example of how the commander in chief is not fit for the position he occupies.

Senate and House committee leaders have expressed dismay that the president would govern via this social medium.

Oh, and then we had Joint Chiefs Chairman Gen. Joseph Dunford declare that no change would take place for now regarding transgender personnel until he gets some specific direction from Defense Secretary James “Mad Dog” Mattis. Until then, Gen. Dunford said, all personnel will be “treated with respect.”

The president, who never wore the nation’s uniform, has disrespected a handful of patriotic Americans simply because they have sought to change their sexual identity.

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As a brief aside, I’m now awaiting a comment from my congressman, Mac Thornberry, who chairs the House Armed Services Committee. His Senate colleague, John McCain, already has spoken about the president’s latest Twitter tempest and the idiocy associated with the president’s insistence on using Twitter to make sweeping policy pronouncements.

Where are you on all this, Mac?