The US Supreme Court has ruled that construction of a $400m (£297m) ballroom at the White House can go ahead, handing a win to President Donald Trump.

In a 5-4 ruling, the justices granted the Trump administration's emergency request, blocking lower court rulings that would have halted construction of an above-ground portion of the project.

The National Trust for Historic Preservation filed the legal challenge, arguing that the president did not have unilateral authority to proceed with construction.

Trump demolished the historic East Wing of the executive residence last autumn to begin building the ballroom.

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