The dollar edged higher on Monday as last week's spike in US bond yields supported the currency, with sterling -- battered by political headwinds -- the biggest loser.

Sterling was down 0.7 per cent at $1.3087, dropping away from an eight-day peak of $1.3229 scaled on Friday on better-than-expected British industry data.

The Sunday Times reported that 40 members of parliament from British Prime Minister Theresa May's Conservative Party have agreed to sign a letter of no-confidence in her.

That is eight short of the number needed to trigger a leadership contest, through which May could be forced from office.

“The political news over the weekend show that her position is coming under increasing pressure and currency markets are reacting to that,” said Alvin Tan, an FX strategist at Societe Generale in London, who recommends holding euros against sterling.

The newspaper report lifted implied currency volatility on sterling -- market gauges to predict price movements for currencies -- from recent lows even as FX options market data showed positions were evenly balanced.

Currency strategists predict further pain for the pound. Morgan Stanley strategists said in a note that sterling was trading 2 per cent above levels that 10-year differentials between UK and US yields suggested, while positioning data showed leveraged investors were still net long sterling assets.

The dollar index against a basket of six major currencies was 0.25 per cent higher at 94.617, following a 6-basis-point rise in long-term US Treasury yields on Friday.

The index ended the previous week with a loss of 0.6 per cent amid investor disappointment that a proposed US corporate tax cut could be delayed to 2019.

Spreads between ten-year US and German bond yields were trading at 198 basis points, not far from a six-month high of 204 basis points hit in late October.

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