The partial shutdown - which began when Trump refused to sign off on budget legislation that did not include funding for his planned border wall - enters its fifth week on Saturday.
"I will be making a major announcement concerning the Humanitarian Crisis on our Southern Border, and the Shutdown, tomorrow afternoon at 3 PM, live from the @WhiteHouse," Trump tweeted without providing further details.
Trump to meet lawmakers at White House as shutdown enters 25th day
Trump has mulled declaring a state of emergency on the southern border in a bid to secure funding for the wall without congressional approval - a move that would almost certainly lead to a challenge in the courts.
The shutdown - the longest in US history - has paralysed Washington and resulted in 800,000 federal employees being furloughed or working without pay.
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