US President Donald Trump, while traveling to France on Air Force One said that the US-mexico wall needs to be transparent. This has been proposed in order to provide the border guards, the visibility into Mexico. He repeated his desire that the wall's final design would have solar panels.

One of Trump's key campaign promises was building the US-Mexico wall, and having Mexico pay for it. It's has been nearly six months since Trump's presidency. Finally, he has found time to acknowledge much of the geographical, and practical difficulties of the construction.

On the flight from Washington to Paris, Trump said that a wall covering almost 3,200 km of the border won't be necessary.

According to the Bbc News, he said 'You have mountains. You have some rivers that are violent and vicious. You have some area far away that you don't really have people crossing. Instead, all that was required was anything from 700 to 900 miles of see-through wall.'

Things that could topple Trump's wall

A 650 miles long see-through wall has already been built under President George W Bush. The wall cost a total of $7 billion. Donald Trump had once mentioned that the wall being transparent was a necessity. This was to protect the guards from drug traffickers.

As reported by the BBC news, “As horrible as it sounds, when they throw the large sacks of the drug over, and if you have people on the other side of the wall, you don't see them.' Trump said. 'They hit you on the head with 27 kg of stuff.

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Nevertheless, tunnels are far more common among the drug traffickers. And no guards have been reported injured in a way that Mr. Trump had mentioned.

While Mr. Trump spoke to the media, he was very confident about involving the solar panels. He had mentioned last month that the panels would provide cheap energy, and would also pay for the disputatious wall.

Will Mexico pay for the wall?

During a campaign, Donald Trump asserted that he will make Mexico pay for the wall. But President Enrique Pena Nieto has discarded this idea.

In the time of his budget unveiling in March, Mr. Trump had allotted a $1.4bn first the wall. Another $2.6bn was allocated for 2018 starting this year, starting on October 1st. However, the Congress only allocated funds for the repair of the existing fence, and not for the wall.

According to the BBC news, US Homeland Security Chief, John Kelly, mentioned that he was dubious of a wall ever being built along the full border.