President Donald Trump has signed an executive order authorising a wall being built along the U.S southern border with Mexico Wednesday.
It was the latest campaign promise that the newly sworn in president made good on during his first full week as commander in chief.
The order came one day after it was announced that Trump would take measures to enact a travel ban on people coming to the U.S. from certain predominately Muslim countries.
The White House subsequently released the "Border Security and Immigration Enforcement Improvements" to the public Wednesday afternoon.
Trump said construction will begin "immediately".
The President said in an interview with ABC News that planning for it was well under way, and repeated his pledge that Mexico will pay for it.
He told the television network that while US taxpayers would initially fund the wall, Mexico would ultimately foot the bill, with reimbursement negotiations starting "relatively soon".
"We'll be reimbursed at a later date from whatever transaction we make from Mexico," he said.
"I'm just telling you there will be a payment. It will be in a form, perhaps a complicated form. What I'm doing is good for the United States. It's also going to be good for Mexico. We want to have a very stable, very solid Mexico."
Speaking at the Department of Homeland Security, Trump said the US was "in the middle of a crisis on our southern border" and claimed the wall would "save thousands of lives, millions of jobs and billions of dollars."
White House Press Secretary Sean Spicer said the measure, which will form part of a wider immigration crackdown under Trump's administration, was a "common sense first step" and added: "One way or another, Mexico will pay for it."
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