Vice President Mike Pence, in a round of television interviews on Tuesday morning, said Trump would use his address to explain to the American people that there is "a humanitarian and security crisis" at the southern USA border.
On Monday afternoon, Trump tweeted that he will address the nation on "Humanitarian and National Security crisis on our Southern Border", without disclosing what decision will be announced during his televised speech on Tuesday evening.
Pence says he's seen "clips of previous presidents talking about the importance of border security and the importance of addressing illegal immigration". "Tuesday night at 9:00 P.M. Eastern".
Bigger picture: Trump plans to visit the U.S. -Mexico border later in the week as a part of his effort to build a border wall, which has the main part of his negotiations with Democrats over the partial government shutdown, The New York Times reports.
Mr Trump skipped a planned trip to Florida to stay in Washington during the Christmas and New Year's holidays after large chunks of the federal government were shut on December 22.
President Donald Trump will travel to the USA border with Mexico on Thursday.More news: Sarri more interested in signing a winger than a striker like Higuain
In the letter, the governors don't take a stance on whether a wall should be built on the border with Mexico - which Trump has insisted on.
Democrats sought written details from the Department of Homeland Security on budget needs; the White House said it would provide that.
Trump maintains that more than $5 billion for a wall is necessary to secure the border.
This will be Trump's first Oval Office speech, and on Thursday he will travel to the southern border to highlight his demand for a barrier.
Pelosi and Schumer called for equal time to respond to Trump. Susan Collins, R-Maine, who has said Senate Majority Leader Mitch McConnell, R-Ky., should take up funding bills from the Democrat-led House. Democrats said Trump will face legal challenges if doing so.
But he says Trump isn't budging on his demand for billions for his border wall. Trump most recently has said he wants a "steel barrier" along the southern border - as opposed to concrete - and that such a construction is needed to prevent an inflow of illegal immigrants from coming into the US, including potential terrorists. "Unfortunately, President Trump keeps rejecting the bipartisan House-passed bills, which have already received strong bipartisan support in the Senate, to re-open the government".
His administration and Congress are deadlocked on funding the barrier.
Despite Trump campaigning for a wall and increased border security in the run-up to the midterm elections, Democrats gained control of the House and polls have shown most Americans oppose the president's proposed wall.