employees on unpaid leave and closed national parks, tourist sites, government websites, office buildings, and more government establishments.
Meanwhile, IMF head Christine Lagarde said it is "mission critical" that the US agrees to a new debt limit to resolve the situation.
Lagarde said that a failure to raise the US debt ceiling would be a far worse threat to the global economy than the current shutdown.
Her comments were echoed by the US Treasury which said a debt default could lead to a financial crisis as bad as 2008 or worse.
Meanwhile, the impact of the shutdown was being felt across the country.
The National Transportation Safety Board did not send investigators to a deadly church bus crash in Tennessee that killed eight people and injured 14 others.
The Labour Department also said it wouldn't release the highly anticipated September jobs report today because the government remains shuttered.