Hundreds of thousands of US federal employees will stay home without pay, as lawmakers fail to reach an agreement to end a government shutdown before Monday.

Although Republican leaders and the opposition Democrats said progress was made in weekend talks, they still pushed back a vote scheduled on Monday. The impasse, which began at midnight Friday, cast a huge shadow over the first anniversary of Donald Trump's inauguration as president. Essential federal services and military activity are continuing, but even active-duty troops will not be paid until the US government is reopened.