US stocks and the dollar plunged again as President Donald Trump intensified his attacks on the US central bank boss calling him “a major loser” for not lowering interest rates.

In a social media post, Trump called on Federal Reserve chair Jerome Powell to cut interest rates “pre-emptively” to help boost the economy, saying Powell had been consistently too slow to respond to economic developments.

“There can be a SLOWING of the economy unless Mr. Too Late, a major loser, lowers interest rates, NOW,” he wrote.

Trump’s criticism of Powell’s handling of the US economy comes as his own plans for tariffs have driven a stock market sell-off and raised fears of economic recession.