The construction of a wall on the US's southern border with Mexico was one of Trump's key campaign promises and which so far has led to a three-week partial shutdown of the USA government. On Monday the White House requested air time for the speech, as is customary in the relationship between a president and the press.
And as for Obama, his stance has consistently been opposed to Trump's wall pledge.
The IRS may recall a large number of furloughed employees to process returns - probably without pay - in accordance with its contingency plans.
With Trump, there were other factors to consider, including his record of deception and his tendency to ramble off script in long speeches. Trump has demanded for 5.6 billion dollars in the 2019 budget for building a wall along the border with Mexico to keep out what he said are illegal migrants and drug traffickers.
There is no end in sight for the shutdown that has halted a quarter of USA government operations since December 22 and forced some 800,000 federal employees to be furloughed or work without pay.
He said he and Homeland Security Secretary Kirstjen Nielsen would brief lawmakers at the Capitol on Tuesday and Wednesday.
House Speaker Nancy Pelosi and Senate Minority Leader Chuck Schumer say Democrats should be given time to respond after Trump's address. But Democrats say the wall is "immoral" and refuse to compromise.More news: Jets Interview Kliff Kingsbury For Head Coaching Job
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Over the weekend, Trump threatened to declare a national state of emergency in order to use still-unspecified presidential "emergency powers" to force a border wall to be built. Democrats have refused to pay for it.
The prototypes for Trump's border wall are seen behind the border fence between Mexico and the United States, in Tijuana, Mexico.
President Donald Trump said Friday that a former president had commended him for his commitment to securing funds to build a wall along the nation's southern border. "Great. Come to the table", she said Monday.
Despite the focus on the border with Mexico, most immigrants living in the USA without authorization entered with visas and then stayed on when their documents ran out.
The shutdown has lasted more than two weeks so far with little indication it will end anytime soon.
Leaning on Senate Republicans, some of whom are growing anxious about the impact of the shutdown, Pelosi said the House would begin passing individual bills this week to reopen federal agencies, starting with the Treasury Department to ensure Americans receive their tax refunds. An impasse over funding for the border wall led to the shuttering of the government before Christmas; the shutdown is now in its third week.
Watch more of the discussion above.