(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."
For the latest on this story, visit