Biden cancels Trump border wall funding

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President Joe Biden has officially ended the "national emergency" that Donald Trump declared in order to take money from the Pentagon to build a wall along the US-Mexico border.

The White House released a letter on Thursday from Biden to House Speaker Nancy Pelosi notifying Congress that he had rescinded his predecessor's February 2019 proclamation.

It was a formality since Biden ordered a halt to border wall construction shortly after he took office.

In his letter, the president said Trump's declaration of a national emergency had been "unwarranted" and he had directed that "no more American taxpayer dollars be diverted to construct a border wall".

He also ordered a review of all money spent on the project so far.

The US has been building border walls for decades under both Democratic and Republican administrations.

Trump made the effort a centrepiece of his first presidential campaign, vowing to build a wall across the entire border and have Mexico pay for it.

Trump took roughly $US6 billion from military funds under the national emergency he declared after Congress refused his demands for wall funding, leading to the longest government shutdown in history.

The Supreme Court upheld a legal challenge to Trump's action in mid-2019.

By the end of his administration, the US had completed more than 720 kilometres of new wall construction along the 3200km border. Much of the construction was in areas where there had already been some form of barrier.