(Bloomberg) — A selloff in US assets deepened as President Donald Trump stepped up criticism of Jerome Powell on social media, with stocks, the dollar and longer-dated Treasuries sliding amid concerns about the Federal Reserve’s future independence.

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Trump’s assurances that tariff talks were progressing did little to stop the rout. The S&P 500 and other major stock indexes fell nearly 3% each while the dollar index weakened to a 15-month low. The benchmark 10-year fell with the yield close to 4.4%. As investors turned away from US securities, haven assets climbed. Gold jumped to another record, above $3,400 an ounce, while the Swiss franc gained more than 1% against the dollar.

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The weakness also spread to the US credit market. In derivatives, the cost of protecting a basket of high-grade credit securities against default rose to the highest in more than a week. Three investment-grade companies looked at selling bonds on Monday, but after seeing the market backdrop, two elected to stand down, and only American Express Co. decided to move forward with a sale.

The US president took to Truth Social escalating his attack on the Fed chair insisting there was “virtually” no inflation and it was time for “preemptive cuts.” The last reading of the Fed’s preferred inflation gauge remains above the central bank’s target, there will be a new readout next week.

National Economic Council Director Kevin Hassett said on Friday that Trump is studying whether he’s able to fire Powell. The comments raised new questions about whether the Fed can maintain its longstanding independence with the president increasingly venting dissatisfaction in harsh terms that the central bank hasn’t moved faster to lower interest rates.

“Were Powell to be fired, the initial reaction would be a huge injection of volatility into financial markets, and the most dramatic rush to the exit from US assets that it is possible to imagine,” said Michael Brown, senior research strategist at Pepperstone. “Not only is the independence of the Fed clearly under threat, but the prospect of de-dollarisation and a move away from US hegemony is an increasingly realistic one.”