(Bloomberg) — The dollar weakened and US equity-index futures dropped, threatening to end the S&P 500 Index’s longest winning streak in two decades, as US trade policy uncertainty hung over markets.

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A gauge of the greenback declined for a second day and contracts for the S&P 500 retreated 0.7% as President Donald Trump said he had no plans to talk to his Chinese counterpart this week. European stock futures also fell. Broad dollar weakness sent Asian currencies higher, with the Taiwanese currency surging as much as 5% in the biggest intraday gain in over three decades. Crude oil slumped over 3% after OPEC+ agreed to a further surge in output. Gold advanced.

There was no cash trading in Treasuries in Asia as Japan was closed for a holiday, along with markets in Hong Kong and China.

An exodus from the world’s reserve currency amid the “sell America” wave after Trump ratcheted up the global trade war has boosted Asian currencies. After a volatile period following the April 2 announcement of new tariffs, financial markets have steadied in the past two weeks amid signs that talks with Asian nations are progressing and trade tensions between China and the US are thawing.

“Recent cyclical gains in equities don’t change the structural ‘Sell America’ theme,” said Charu Chanana, the chief investment strategist at Saxo Markets in Singapore. “Trade deal optimism is giving way to the reality of complex, slow-moving negotiations.”

After several days of rally built on hopes of trade deals and policy clarity, markets are now digesting the complexity of achieving comprehensive trade agreements, which suggest prolonged uncertainty impacting business decisions, she said.

Trump suggested that his administration could soon strike trade deals with some countries. The president also said in an interview Sunday on NBC that he’s willing to lower the tariff on Chinese imports to spur trade. He also signaled that his aides are having conversations with counterparts from China. Last week, the Asian nation said it’s evaluating talks with the US.

The currency strength in Asia has traders on watch for more signs of central bank intervention to protect their currencies from a further rapid appreciation. Speculators have turned the most bearish against the dollar since September.