Democrats, who now control the U.S. House of Representatives, have rejected Trump's demand for $5.7 billion to help build a wall.
Trump is seeking to change that Tuesday night, as he delivers a primetime address from the Oval Office where he will reportedly try to argue that the wall is needed to stop a "crisis."
Trump is scheduled to address the nation Tuesday night and lay out his case for the wall, which Democrats oppose.
The Trump administration is pushing hard to portray the southern border with Mexico as an imminent "humanitarian and national security crisis" to win support for border wall funding in a fight with lawmakers that has brought the country to a 17-day partial government shutdown.
White House press secretary Sarah Huckabee Sanders announced Trump's plans to travel to the border on Thursday.
But Trump and the Transportation Security Administration pushed back on any suggestion that the call-outs represented a "sickout" that was having a significant effect on USA air travel. About 800,000 government workers have been either furloughed or working without pay during the shutdown.
We don't know what Trump will say tomorrow, but it's possible he will declare a national emergency at the border and announce his intention to wall off more of it without a congressional appropriation of funds for that objective.
The White House moved to pre-empt the Democrats, telling reporters Monday that tax refunds would be paid despite the shutdown.
It is true that border walls hold a special place in former President George W. Bush's legacy.
Past presidents have supported various measures to curb illegal immigration and secure the U.S. -Mexico border, including with strong fencing in some areas, though none of those policies resembled Trump's proposal for a multibillion-dollar steel wall covering most of the border.
The talks over ending the shutdown have been at an impasse over Trump's demand for the wall.
Pelosi and Schumer called for equal time to respond to Trump. He promised during the campaign that Mexico would pay for the wall.
Misleading characterizations of the situations like that are what Bauer claims could hurt Trump if he has to defend use of the National Emergencies Act of 1976 in court. Democrats, who have a majority in the House and are willing to fund other border security measures, will not approve any budget that includes money for a wall, which they see as an expensive and ineffective political gimmick.