By Christopher Giles
BBC Reality Check
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- US election 2020
image copyrightGetty Imagesimage captionPresident Trump made building a wall a key plank of his 2016 election campaign
President Donald Trump is visiting the southern border in Texas to claim success in the construction of a border fence with Mexico.
The White House said his visit would "mark the completion of more than 400 miles of border wall — a promise made, promise kept…"
So how much of the border wall has Mr Trump managed to build during his term in office?