Update
The partial federal shutdown of the U.S. government will not affect USCIS’s fee-funded activities directly. The USCIS offices will remain open and all individuals should attend scheduled interviews and appointments. Some of USCIS programs which will expire or require reauthorization by Congress will be affected. Please review the USCIS Email Alert, “Lapse in Federal Funding Does Not Impact Most USCIS Operations” for more details.
Source of Information:
USCIS (USCIS.gov), 12/22/18, News Alert:
Lapse in Federal Funding Does Not Impact Most USCIS Operations
Related Link:
The Hill (thehill.com), 1/3/19, news article:
White House says lawmakers invited back for shutdown talks Friday