The US Senate has voted overwhelmingly to pass a mammoth spending package including $US675 billion ($A938 billion) for the Defense Department and a measure to keep the entire federal government open until December 7, a step towards avoiding a September 30 shutdown.
The Senate voted 93 to 7 for the $US855 billion package, combining the two largest annual spending bills - for the Labor, Health and Human Services and Education departments as well as the Pentagon.
It also includes a continuing resolution that would cover government operations not otherwise funded before the current fiscal year ends on September 30, giving lawmakers more time to finalise next year's spending.
To become law, the package would have to pass the House of Representatives, which is out of Washington until September 25, and then be signed by President Donald Trump.
Trump has threatened to let the government shut down on October 1 if he does not get the money he wants to build a wall along the US-Mexico border.
However, a veto could lead to an embarrassing government shutdown weeks before the November 6 mid-term elections, when control of congress by Trump's fellow Republicans is up for grabs.
It also would delay an increase in spending for the military, something strongly backed by most Republicans and a policy goal of Trump's.
"Critically, after subjecting America's all-volunteer armed forces to years of belt-tightening, this legislation will build on our recent progress in rebuilding the readiness of our military and investing more in the men and women who wear the uniform," the Senate's Republican majority leader, Mitch McConnell, said in a speech urging support for the legislation.
Trump campaigned for president in 2016 vowing to build a wall that he said Mexico would finance.
But Mexico has baulked and Trump instead has had to turn to congress for construction funds. Lawmakers provided $US1.57 billion this year for physical barriers and related technology along the southwest border.
Some have estimated the total cost of the edifice at more than $US24 billion.
The White House has not yet indicated whether Trump would sign the measure, if it is also approved by the House.
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