The world’s top central banker Jerome Powell has hit back at the US president in an unprecedented video statement on social media.
It follows the Trump administration opening a criminal investigation against Jerome Powell, chair of the U.S. Federal Reserve. Over the past year the president has insulted Powell publicly, criticising his decisions not to cut interest rates, as well as calling the Fed chair "Mr Too Late", a “major loser” and a "numbskull".
Justin Webb, Sarah Smith and Anthony Zurcher explain why it matters and the impact this very public spat could have on the US and global economy.
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