President Trump Donald John TrumpObama calls on Senate not to fill Ginsburg's vacancy until after election Planned Parenthood: 'The fate of our rights' depends on Ginsburg replacement Progressive group to spend M in ad campaign on Supreme Court vacancy MORE tweeted Friday afternoon that he will be making a "major announcement" Saturday from the White House concerning the ongoing government shutdown, which on Friday entered its 28th day.

The president wrote in a brief message that the announcement would concern the "Humanitarian Crisis on our Southern Border" and the shutdown.

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"I will be making a major announcement concerning the Humanitarian Crisis on our Southern Border, and the Shutdown, tomorrow afternoon at 3 P.M., live from the @WhiteHouse," Trump wrote

The message raises the possibility that the president is planning to declare a national emergency to circumvent Congress and win funding for his wall — while ending the partial government shutdown at the same time.

I will be making a major announcement concerning the Humanitarian Crisis on our Southern Border, and the Shutdown, tomorrow afternoon at 3 P.M., live from the @WhiteHouse. — Donald J. Trump (@realDonaldTrump) January 18, 2019

Trump has repeatedly flirted with the idea of declaring a national emergency, though this week he seemed to back away from that proposal, which some critics warned could set a negative precedent.

“It's the easy way out, but Congress should do this,” Trump told reporters earlier in January, adding he would “rather not” pursue the option due to the likelihood of facing court challenges from Democrats.

Trump and the Democratic-controlled House have battled for weeks over the shutdown, which was triggered by the president's demand for more than $5 billion in funding for a border wall.

The fight intensified this week with Speaker Nancy Pelosi Nancy PelosiPelosi: Ginsburg successor must uphold commitment to 'equality, opportunity and justice for all' Bipartisan praise pours in after Ginsburg's death Pelosi orders Capitol flags at half-staff to honor Ginsburg MORE (D-Calif.) urging Trump to put off the State of the Union address and Trump responding by preventing congressional delegations from traveling overseas on military flights during the shutdown.

That effectively canceled a trip Pelosi and other Democrats had planned to take to Afghanistan this weekend.

Polls suggest Trump is losing the battle for public opinion over the shutdown, another factor in the president's decision of what to do next.