The U.S. is still debating the value of fencing on its southwest border but the U.K. is moving forward, preparing to erect a 1 kilometer wall to protect the departure point from France to Britain, according to reports Wednesday.

Officials said their goal is to stop migrants in Calais from boarding trucks headed to Britain through the tunnel under the English Channel, the BBC reported.

The 13-foot wall is controversial, with some migrant-rights advocates calling it the wrong way to handle the situation, but the government said it’s needed to stop increasingly aggressive attacks from a migrant camp at the port.

Most of the port is already fenced off from the camp, dubbed the “jungle.” But British officials say a wall is needed at least along a portion of the route.

“We are going to start building this big new wall very soon. We’ve done the fence; now we are doing a wall,” UK Home Office minister Robert Goodwill said, according to the BBC.

Fencing has long been an important part of security, but is also often seen as a symbol of division.

After GOP presidential candidate Donald Trump proposed a wall on the southwest border to try to control illegal immigration from Latin America, he drew fierce fire from Democrats, human rights activists and even Pope Francis, who dubbed it unchristian.

Mr. Trump hasn’t detailed what the wall would look like, but has remained firm that it be part of any immigration policy.

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