The US currency also won back ground against the Swiss franc, which has served as a safe-haven along with the yen. The dollar was up 0.8 percent at $0.9757 franc after going as high as $0.9789. It had slid to a five-week low of $0.9680 francs on Friday.

Dealers cautioned against complacency with Mrs Clinton only holding a shaky lead in Electoral College forecasts.

"The dollar heads into the presidential elections with the latest FBI verdict favouring Clinton. I don't see much upside for the dollar from current levels, however, as caution is likely to grip the market ahead of the voting," said Kyosuke Suzuki, director of forex at Societe Generale in Tokyo.

Meanwhile, the Mexican peso surged. The US currency was down 1.8 percent at 18.68 Mexican pesos to the dollar after touching 18.56, its weakest since October 26.