As a reality television star and the most talked about US President in years, Donald Trump is used to being on primetime TV.
But tonight will be different. Tonight, for the first time, he will address the nation from the Oval Office.
At first, it was not clear which networks would broadcast the message. TV channels do not have to carry presidential addresses and in the past have refused to do so.
But this was a no-brainer for TV executives - Donald Trump is box office and his address will take a prime position in the evening schedules across all the major networks.
The speech is expected to last around eight minutes and will air at 9pm EST (2am Irish time).
I am pleased to inform you that I will Address the Nation on the Humanitarian and National Security crisis on our Southern Border. Tuesday night at 9:00 P.M. Eastern.
— Donald J. Trump (@realDonaldTrump) January 7, 2019
US Presidents use these addresses at times of national emergency or to make big announcements.
Mr Trump is expected to use his address to make the case for his border wall.
A row over funding for the wall has led to a partial government shutdown that is now in its 18th day.
It is affecting 800,000 federal workers.
Mr Trump claims he can relate to the struggles of those unpaid workers who are trying to pay their bills.
He has also claimed that many of them understand that this shutdown is necessary in order to achieve border security.
But in reality, there is believed to be major concerns in the White House that the Trump Administration is losing the battle for public support when it comes to the wall and resulting shutdown.
Friday is payday for many in the US, and if government workers affected by the shutdown miss out on a pay cheque, opposition to the president is likely to increase even further.
Mr Trump has suggested declaring a national emergency at the border, which could allow him to bypass Congress when it comes to funding his wall.
But that poses a big question - is there an emergency at the border with Mexico?
Tonight, we can expect Donald Trump to make lots of references to a humanitarian and security crisis at the border.
He will probably claim that the existing infrastructure cannot cope with the influx of migrants and that criminals are trying to enter the US.
In recent days, the president and his staff have been claiming that thousands of potential terrorists are being stopped at the border every year, but critics have questioned these figures.
Lots of Mr Trump's claims are questioned and are often downright inaccurate. Surely an address from the Oval Office will only contain hard facts, truth and honesty?
Democrats do not think so. They have demanded equal air time tonight to rebut the president's address.
They claim Donald Trump's statement will be "full of malice and misinformation".
During the presidential campaign, Donald Trump was on primetime TV every evening promising a border wall.
Tonight, he will be back on the airwaves trying to convince a sceptical nation to support his central campaign pledge.
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