President Trump Donald John TrumpHR McMaster says president's policy to withdraw troops from Afghanistan is 'unwise' Cast of 'Parks and Rec' reunite for virtual town hall to address Wisconsin voters Biden says Trump should step down over coronavirus response MORE late Sunday night quoted a column by Pat Buchanan, a man the president once called a "Hitler lover," to back his proposal to build a wall along the U.S.-Mexico border.

In a pair of tweets, Trump pointed to Buchanan's argument that the president's proposal is "dead on," and saying that something needs done or the U.S., "as we have known it, is going to cease to exist."

Trump added that the "great people of our Country demand proper Border Security NOW!."

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"The Trump portrait of an unsustainable Border Crisis is dead on. 'In the last two years, ICE officers made 266,000 arrests of aliens with Criminal Records, including those charged or convicted of 100,000 assaults, 30,000 sex crimes & 4000 violent killings,' " Trump tweeted.

"America's Southern Border is eventually going to be militarized and defended or the United States, as we have known it, is going to cease to exist...And Americans will not go gentle into that good night. Patrick Buchanan. The great people of our Country demand proper Border Security NOW!" Trump continued.

The Trump portrait of an unsustainable Border Crisis is dead on. “In the last two years, ICE officers made 266,000 arrests of aliens with Criminal Records, including those charged or convicted of 100,000 assaults, 30,000 sex crimes & 4000 violent killings.” America’s Southern.... — Donald J. Trump (@realDonaldTrump) January 13, 2019

....Border is eventually going to be militarized and defended or the United States, as we have known it, is going to cease to exist...And Americans will not go gentle into that good night. Patrick Buchanan. The great people of our Country demand proper Border Security NOW! — Donald J. Trump (@realDonaldTrump) January 13, 2019

The president was quoting a column that Buchanan, a political commentator and former presidential candidate, wrote for cnsnews.com in which he encouraged Trump to go through with his threats to declare the situation at the border a national emergency and begin construction of a wall on the southern border.

In 1999, Trump called Buchanan a "Hitler lover" and said it was "incredible that anybody could embrace this guy." Buchanan, who has often been accused of expressing racist and anti-Semitic views, at the time was seeking the Reform Party's nomination for president.