U.S. President Donald Trump and Republican lawmakers were locked in a standoff with Democrats on Saturday over the U.S. government shutdown, with Republicans saying they would not negotiate on immigration until the government is reopened.

Funding for federal agencies ran out at midnight with no agreement in Congress, meaning the second year of Trump's presidency began without a fully functioning government.

Democrats stuck to demands that any short-term spending legislation must include protections for young undocumented immigrants known as "Dreamers." Republicans in turn said they would not negotiate on immigration until Democrats gave them the votes needed to reopen the government.