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President Donald Trump says his proposed border wall may not need to cover the whole US frontier with Mexico because of existing natural barriers.
He told journalists travelling on Air Force One to France that it also needed to be transparent, to offer border guards visibility into Mexico.
He also reiterated his desire the final design would involve solar panels.
Building the wall, and having it paid for by Mexico, was one of Mr Trump's key campaign promises.
Now, almost six months into his presidency, it seems he is acknowledging some of the geographical and practical difficulties of such a construction.
On the flight to Paris from Washington, Mr Trump told reporters that a wall along the whole 2,000-mile (3,200km) US-Mexico border might not be necessary.
"You have mountains. You have some rivers that are violent and vicious," he said.
"You have some areas that are so far away that you don't really have people crossing."
Instead, all that was required was "anywhere from 700 to 900 miles of see-through wall".
There is already about 650 miles of see-through fencing along the border. It was built under President George W Bush and cost an estimated $7bn (£5.4bn).
2017.07.14 / 14:29