If we are going to be totally candid and honest, the Twitter tirade that Donald J. Trump let loose this weekend against four Democratic members of Congress reveals a nasty and sinister side of the president of the United States.

He told four women of color to return to “where they came from.” Three of the women were born in the United States of America; a fourth was born in Somalia but is a naturalized U.S. citizen.

We have just witnessed an evil side of one human being’s attitude toward individuals of certain ethnic or racial backgrounds. Indeed, have we ever heard folks say such things of those from, say, Scandinavia, or western Europe, or even from southern Europe?

No. This is the kind of blathering that flies out of the mouths of those who proclaim western European heritage. They aim such nonsense at those who, um, look differently than they do. Or, they might worship a non-Christian religious faith.

The four congresswomen are well-known to political junkies: Ilhan Omar of Minnesota, Alexandrea Ocasio-Cortez of New York, Ayanna Pressley of Massachusetts and Rashida Tlaib of Michigan. They all have spoken out frequently and loudly. They apparently have gotten under the president’s skin.

So he lashed out via Twitter with that vile message about them return to “where they came from.”

There longer can be an “Is this it?” moment for Trump. One might think any one of dozens of hideous statements or insults would have doomed this individual’s political career. They didn’t. This one likely won’t, either. Why? Because the president has managed to redefine the standards of decency we normally have set for those who seek to represent us in government.

His political base, the only audience he seems to aim his remarks, will continue to slobber all over him. The rest of us will shake our heads in disgust.

So very sad.