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US stocks and the dollar plunged again as President Donald Trump intensified his attacks on the US central bank boss and called him "a major loser". In a social media post, Trump called on Federal Reserve chair Jerome Powell to cut interest rates "pre-emptively" to help boost the economy, and said Powell had been consistently too slow to respond to economic developments. Trump's criticism of Powell's handling of the US economy came as his own plans for tariffs have driven a stock market sell-off and raised fears of economic recession. Subscribe here: http://bit.ly/1rbfUog For more news, analysis and features visit: www.bbc.com/news #BBCNews