The US dollar fell against most major currencies during Mondays trading as markets closely awaited key economic data due later this week.
This comes amid market concerns over a potential US government shutdown if lawmakers in Congress fail to pass the funding bill before the end of September.
President Donald Trump warned of possible mass layoffs of federal employees if the law is not passed and the shutdown goes into effect.
Investors are closely watching important economic releases later this week, most notably US manufacturing activity data, as well as the monthly employment report due on Friday.
In trading, the dollar index fell by 0.2% to 97.9 points as of 17:19 GMT, recording a high of 98.1 points and a low of 97.7 points.
Australian Dollar
The Australian dollar rose 0.5% against its US counterpart to 0.6578 as of 17:29 GMT.
Canadian Dollar
The Canadian dollar gained 0.1% against the US dollar to 0.7190 as of 17:29 GMT.