Last month, the president went to San Diego to check out how his border wall was coming along.

And you'll see it's a combination of steel concrete.

And as one of the folks you said, it really is virtually impenetrable.

He stood in front of stacks of metal poles and talked about the cement and rebar that made the slats for his wall impossible to cut through.

He talked about the special heat-absorbing design that made the wall sizzling to the touch.

Trump said the government had even hired mountain climbers to test the wall out.

And some of them were champions and we gave them different prototypes of walls.

And this was the one that was hardest to climb.

We've all seen the pictures of young people climbing.

This week, we learned the president had other ideas for how to beef up security along the U.S.

Mexico border.

He reportedly suggested building a moat along one side of the wall, filling it with snakes and

alligators. He suggested opening fire on migrants, shooting them in the legs.

At one point, he also mused about arming U.S. forces with bayonets.

Nick Miroff reports on Homeland Security for the Washington Post.

He thought that you could have a kind of a human wall.

If he couldn't get a wall built in time, he would deploy a human wall of soldiers or U.S. border patrol agents who would wield bayonets to keep the migrants back.

Presidential aides didn't take many of these ideas very seriously.

And these are the real people. These are the workers that put up the wall, by the way.

All of these guys...

But at the border last month, Nick says, you could see how what started out as a presidential

brainstorm was becoming reality.

...