Donald Trump has revealed his position paper on illegal immigration.

It appeals to a lot of Americans — apparently.

He wants to build an impenetrable wall; he wants to get rid of birthright citizenship; he demands that we deport all 11 million immigrants who are here illegally.

The question remains of the leading Republican Party presidential candidate: How do we do this?

I think the nuttiest notion deals with how we persuade Mexico to pay for building the wall. I’m trying to understand how a foreign government could demand something like that of, oh, the United States of America!

Would an American president stand still for such a demand? Would our Congress be willing to spend the money? Of course not!

I am wondering how a President Trump (those two words make my fingers tremble as I type them) could possibly expect Mexico to foot the bill for an enormous wall stretching from the mouth of the Rio Grande River to the Pacific Ocean.

And what, I must ask, would such a demand do to the long-standing friendship between the nations?

As the Washington Post reported: “… Trump says that undocumented immigrants ‘have to go,’ and he has vowed to undo President Obama’s Deferred Action for Childhood Arrivals program.”

The president issued an executive order that seek in part to protect temporarily those who were brought here when they were children from deportation. Trump would undo that order, round up those protected from deportation and send them back to the country their parents fled … even though they have grown up as Americans?

Someone has to explain to me how that is a humane policy.