The U.S. Federal Government stopped operating on Saturday, February 20, 2018, after a stopgap spending bill failed to pass. Congress will continue to meet to try to come to a funding agreement.

In the meantime, federal government offices that are not fee-funded or designated to continue operations because they offer security or other essential services will generally have to shut down and furlough most workers, until a deal is struck.

The immigration process is largely fee-funded or related to security operations, however, and so most immigration operations will continue except as described in this NAFSA article. 

For additional context, please visit USCIS website for news and alerts.