According to a statement published on January 14, 2019, the Office of the U.S. Trade Representative (USTR) implemented its “lapse in appropriations contingency plan.”
According to the Office of Management & Budget (OMB) contingency plan, the USTR will have 74 staff members continue to work, with the majority of their staff furloughed.
The press release may be found here:
The OMB contingency plan may be found here:
https://www.whitehouse.gov/wp-content/uploads/2018/09/OMB-Contingency-Plan-Memorandum-20181001.pdf