Work begins on prototypes for Trump's Mexico wall

President Donald Trump says the wall should be transparent to stop people from "catapulting" and "throwing" drugs into the US.

Government contractors have started to build prototypes of President Trump's proposed border wall with Mexico.

Bidding documents say four of the eight prototypes are to be solid concrete and four are to be made of "other materials".

Mr Trump said on Friday that the wall should be see-through, repeating earlier claims that it should be transparent to curb the flow of drugs into the country.

"They take drugs, literally, and they throw it - 100lbs of drugs - they throw it over the wall," he said at a rally in Alabama.

"They have catapults. They throw it over the wall and it lands, and it hits somebody on the head and you don't even know they are there.

"Believe it or not, this is the kind of stuff that happens. So you need to have a great wall but it has to be see-through."

A green tarpaulin hanging on a chain-link fence blocked views of the work, in a remote area of San Diego, and is expected to last 30 days.

Roy Villarreal, acting chief of the Border Patrol's San Diego sector, told reporters another contractor will evaluate each model, which will be up to 30ft (nine metres) high and 30ft long.

"It may not result in a singular winner. It may be a combination of...Read More HERE