Donald J. Trump’s very first specious campaign promise en route to his being elected president of the United States was that he would build a “beautiful wall” along the length of our nation’s southern border.

He would secure our border with Mexico against those hordes or rapists, murders, drug dealers and, oh yes, international terrorists intent on destroying the United States of America.

And he’d make Mexico pay for it, too! That, of course, drew the expected rebuke from Mexican officials who said, in effect, “Oh, no we won’t.”

Now we have a Homeland Security secretary-designate, retired Marine Gen. John Kelly, on board with the still-forming Trump administration.

What about that wall, Gen. Kelly?

Are we going to build it? Do you support the president-elect on that nonsensical notion? And what about the “deportation force,” general? Are you going to hire all the thousands of homeland security agents it will take to round up the 11 million — or so — illegal immigrants living in this country?

Trump’s initial campaign pledge makes the homeland security appointment all that more important. The way I figure it, if Trump was going to make illegal immigration his signature issue — which he did when he rode down the Trump Tower elevator the day he announced his candidacy — then he meant for it to be the most important promise he’d make.

It’s interesting to me that we’ve heard nary a peep from Gen. Kelly — or the president-elect, for that matter — on the strategy we’re going to employ to build the wall.

Let’s hear it, guys!