Portions of U.S. government shut down

Portions of U.S. government shut down

October 1, 2013 Updated Oct 1, 2013 at 6:11 AM EDT

(CBS News) A late-night, last-ditch effort by House Republicans to delay the implementation of the Affordable Care Act by pushing back the program's start by one year failed quickly in the Democrat-controlled Senate Monday night.

Minutes later, the Republican-controlled House said they would not take up the issue again Monday, setting the stage for a partial shutdown of the government, which took affect at midnight.

The president's Office of Management and Budget sent out a memo just before the midnight deadline informing departments to begin their shut-down plans.

President Obama Monday afternoon chided House Republicans for using federal funding to negotiate over Obamacare, calling it "the height of irresponsibility."

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