The Canadian dollar fell against most of its counterparts Monday, due to pressures on oil prices, which is one of the main Canadian exports.
Investors are focused on the progress in the $1.2 trillion US infrastructure spending agreement.
The Canadian dollar gained 1.25% last week, as the US dollar fell.
As of 15:06 GMT, WTI crude August futures fell 0.8% to $73.4 a barrel, after hitting a high of $74.4 and a low of $72.9.
Brent August futures fell 0.9% to $75.4 a barrel, after hitting a high of $76.6 and a low of $75.1.
As of 15:23 GMT, CAD/USD fell 0.3% to 0.811, after hitting a high of 0.8139 and a low of 0.8098.