The US government shutdown is set to stretch into next week after senators voted Friday for a fourth time to reject a funding fix proposed by President Donald Trump's Republicans.

Federal agencies have been out of money since Wednesday -- with a wide range of public services crippled -- as a result of deadlocked talks in Congress on how to keep the lights on.

Tourist sites such as the Washington Monument have closed, key data on employment has been delayed and some official websites have ground to a halt, although other areas of government have yet to be affected.

Some 750,000 employees are likely to be put on furlough -- a kind of enforced leave with backpay after the shutdown -- as the funding crisis deepens.

Senate leaders have no plans to keep the upper chamber of Congress in sessi

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