US crude oil prices were down 0.5% at $52.09 a barrel, while the Canadian dollar declined 0.1% to 1.2746 per greenback, or 78.46 US cents. It touched its weakest since last Monday at 1.2799.
The greenback soared to a three-year high of 102.99 against a basket of currencies in March, before ending the year at 89.96, down 6.77pc on the year and 12.65pc from its March high.
World stocks scaled new peaks after lawmakers and aides said that Congressional negotiators were closing in on a $900 billion COVID-19 aid bill in the United States.