U.S. lawmakers struggled on Sunday to reach a breakthrough during the second day of a government shutdown.
If Republicans and Democrats are unable to resolve their differences, federal agencies could remain partially closed when the work week begins on Monday.
During shutdowns, non-essential government employees are furloughed, or placed on temporary unpaid leave. Workers deemed essential, including those dealing with public safety and national security, keep working.
The last shutdown, in October 2013, lasted more than two weeks and more than 800,000 federal employees were furloughed. There is no official tally of how many would be off work this time. Here are some

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