US President Donald Trump says he has reached a tentative agreement with lawmakers for three weeks in stop-gap funding that would end a partial government shutdown.
A senior Democratic aide says money the president demanded for a border wall is not included in the deal.
Trump had previously insisted on the inclusion of $US5.7 billion ($A8b) to help pay for a wall along the vast US-Mexico border in any legislation to fund government agencies.
"I am very proud to announce today that we have reached a deal to end the shutdown and reopen the federal government," Trump said in remarks in the White House Rose Garden on Friday.
"In a short while, I will sign a bill to open our government for three weeks until February 15. I will make sure that all employees receive their back pay very quickly, or as soon as possible," Trump said.
With the effects of the shutdown spreading on Friday, Trump said a bipartisan congressional conference committee would meet to come up with a plan for border security.
Trump triggered the shutdown, which began on December 22 and idled some 800,000 government employees, with his wall-funding demand.
However Democrats, who control the House of Representatives, rejected it on the grounds that a wall would be costly, ineffective and immoral.
Trump, whose Republicans have a majority in the Senate, has said it is necessary to curb illegal immigration and drug trafficking.
The arrangement, which would require passage in the House and Senate and Trump's signature, would leave his request for wall funding for later talks, a House Democratic aide said.
The House could pass the measure as soon as Friday if Republicans agree to hold a vote, the aide said.
A Senate Republican aide said Senate Majority Leader Mitch McConnell was expected to press for passage of a three-week funding bill on Friday.
"We do not need 2000 miles of concrete wall from sea to shining sea. We never did," Trump said.
"We never proposed that. We never wanted that because we have barriers at the border where natural structures are as good as anything that we could build," he said.
"Our proposed structures will be in predetermined, high-risk locations that have been specifically identified by the Border Patrol to stop illicit flows of people and drugs."
The temporary funding bill would extend agency funding at the last fiscal year's levels and would include some money for border security - but not a wall.
In one of the many effects of the shutdown, hundreds of flights were grounded or delayed at airports in the New York area and Philadelphia on Friday as more air traffic controllers called in sick.
Hundreds of thousands of federal workers have been furloughed or, as with some airport workers, required to work without pay.
In its 35th day, it is the longest such shutdown in US history.
Many employees as well as contractors were turning to unemployment assistance, food banks and other support.
Others began seeking new jobs.
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