"USTR has implemented its lapse in appropriations contingency plan," the agency said in a statement on its website. "Excepted personnel will ensure USTR continues to conduct operations, including trade negotiations and enforcement."
A partial federal government shutdown entered its 24th day on Monday over President Donald Trump's demand that a spending bill to fully fund the government include $5.7 billion (£4.4 billion) to build a wall along the border with Mexico as he promised during his campaign. Democrats have refused further negotiations until the government is reopened.
The United States has initiated trade talks over the past year with China, the European Union and others. U.S. officials went to Beijing last week and discussions are to resume in Washington sometime this month.
(Reporting by Chris Prentice; Editing by Bill Trott)
