Key Facts

• The US Supreme Court has ruled that President Donald Trump's executive order limiting birthright citizenship is unconstitutional.
• The executive order aimed to change a long-standing policy that grants citizenship to children born in the United States, regardless of their parents' nationality or immigration status.
• The court's decision is a major blow to Trump, as it thwarts one of his key campaign promises to restrict immigration.
• The policy that has been in place for over a century, known as birthright citizenship, was established by the 14th Amendment to the US Constitution.
• The BBC's Chief North America Correspondent, Gary O'Donoghue, provides analysis on the court's decision and its implications for Trump's presidency.