A divided federal appeals court has ruled that President Donald Trump's executive order ending birthright citizenship is unconstitutional.

In a landmark advisory opinion issued on Wednesday, the world’s highest court said polluting countries may be in breach of international law if they do not protect the planet from the “existential threat” posed by climate change. It was the first time the International Court of Justice had formally addressed the climate crisis.

Every court which has ruled on President Trump’s executive order concerning birthright citizenship has found it unconstitutional.