In a fillip to sentiment overnight, Trump said talks to resolve the damaging trade war with China were going "very well". Bloomberg also reported that the two sides are moving closer to an agreement, citing people familiar with the talks.
However, with no official reassurance from the Chinese on Thursday, and only a day after Trump said a deal might not come until after the 2020 presidential election, the recovery promptly stalled in Asian trade.
"It's too soon to say whether it's a rebound or a dead-cat bounce, that's the way I look at risk at the moment," said Matt Simpson, a senior market analyst at Gain Capital in Singapore.
Movements in major currencies were modest. The safe-haven Japanese yen steadied at 108.84 per dollar, while the Swiss franc inched higher to 0.9879 per dollar.
The euro firmed marginally against the dollar to $1.1084, which pushed the greenback down 0.1% against a basket of currencies to 97.551.
The British pound crept back to the eight-month high hit overnight as expectations firmed that Prime Minister Boris Johnson would win a majority at next week's election.
The focus remained on trade news, or the lack of it, with investors also looking ahead to non-farm payrolls data on Friday as a possible source of further disappointment with the state of the U.S. economy.
"I thought the markets had stopped playing headline ping- pong on trade, but evidently not," said National Australia Bank's head FX strategist, Ray Attrill. "Another day, another reversal of what happened the previous day."
Elsewhere, domestic factors moved the Antipodean currencies in opposite directions.
The Australian dollar <AUD=D3> slipped 0.2% to $0.6838 after softer-than-expected retail sales data.
The kiwi climbed by the same margin to a four-month high, after softer-than-expected banking reforms led to a reduction in rate-cut expectations.
The Reserve Bank of New Zealand lifted bank capital requirements, but not as much as some investors had feared. The long implementation time has also reduced expectations that monetary easing might be needed to offset the hike's tightening effects.
"A softening in the proposals, combined with a more positive domestic outlook...mean we are changing our Official Cash Rate (OCR) call to only one further 25bp OCR cut, in May next year, taking the OCR to 0.75%," ANZ analysts said in an emailed note.
The kiwi added 0.4% to $0.6555, its highest since August, and has put on more than a cent this week as business sentiment there has rebounded as well.
Against the Aussie, the kiwi has gained about 3% in a month to stand at a four-month high of NZ$1.0457 per A$1.
The Canadian dollar <CAD=D3> hit a one-month high of $1.3203 per greenback after the country's central bank held interest rates steady and said there were signs the global economy was stabilising.
A rise in oil prices also supported the exporter's currency, and lifted the Norwegian krone slightly to 9.1643 per dollar. [O/R]
By Tom Westbrook