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Donald Trump says his border wall with Mexico needs to be see-through, to prevent passers-by being hit on the head by flying drugs.

When President Trump, who is under criminal investigation for obstruction of justice , told reporters the wall required transparency, he wasn’t talking about an open procurement process. He meant literally see-through.

He said: “You have to be able to see through it. In other words, if you can’t see through that wall — so it could be a steel wall with openings, but you have to have openings because you have to see what’s on the other side of the wall.”

He explained there was a real and present danger of drug dealers hurling heavy sacks of narcotics over his giant fence.

(Image: REUTERS)

He went on: “As horrible as it sounds, when they throw the large sacks of drugs over, and if you have people on the other side of the wall, you don’t see them—they hit you on the head with 60 pounds of stuff? It’s over.

“As crazy as that sounds, you need transparency through that wall. But we have some incredible designs.”

President Trump made the astonishing comments to reporters on Air Force One on Wednesday, but they were only reported yesterday because everyone assumed he was kidding.

He also insists he still intends for the wall to have solar panels, which would make it “pay for itself”.

Experts agree that such a plan could raise money, but it would take decades to meet the estimated £21 billion cost of the wall.

Democrat Congressman Adam Schiff mused on Twitter yesterday: “If an American is hit over head with a big sack of drugs flying over the wall, would it be covered by Trumpcare, or would Mexico pay for it?”

It comes as Trump’s poll ratings hit an all-time low, after just 36% of those polled by ABC News and the Washington Post said he was doing a good job.

Trump’s approval rating is still the worst of any US President in the history of polling.

The next worst polling for a President after six months in office was Gerald Ford, who had a 39% approval rating in February 1975.

Six months into his presidency, Barack Obama had a 59% approval rating.