Why does Trump care about the Japanese yen?

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In a highly unusual move, the US has stepped in to back Japan's currency, the yen. Donald Trump calls it a "signal of friendship" but what is Washington hoping to achieve? And what does the move reveal about Japan's economy, after years of deflation and ultra-low interest rates? Rahul Tandon and Will Bain assess the intervention with the help of the BBC's "yen geek" Mariko Oi. Presenters: Rahul Tandon, Will Bain and Mariko Oi Producer: Gideon Long You can email the team: businessdaily@bbc.co.uk (Picture: A woman walks past a stock market indicator board in Tokyo, Japan, 03 August 2026. Credit: EPA/Shutterstock)