Organized by Unite the Right -- the same network that called last year's protest in Charlottesville, Virginia -- Sunday's rally will once again see the extremists stand face-to-face with anti-fascists, who are staging a counter protest.
"I don't know exactly what will happen, but it probably will not be good," tweeted Richard Spencer, a leader of the so-called "alt-right" movement, who said he would be staying away from the rally.
All firearms will be banned from the Washington protest site, including those legally carried by licensed gun owners, officials said.
Rally organizers encouraged supporters to bring a US or Confederate flags, and cautioned not to react angrily to counter protesters.
"There will certainly be provocateurs trying to get a reaction out of you by trying to stick cameras in peoples' faces, yelling, etc," the Unite the Right website stated.
Members of the leftist Answer Coalition plan a "mass action" to protest the white nationalists.
Rifles and flaming torches
Last year's protests in Charlottesville on August 11 saw hundreds of neo-Nazi sympathizers, accompanied by rifle-carrying men, chanting white nationalist and anti-Jewish slogans while wielding flaming torches -- scenes reminiscent of racist rallies held before the Civil Rights movement of the 1950s and 60s.
When the demonstrations continued on August 12, fighting broke out between neo-Nazis and counterdemonstrators, including members of the anti-fascist Antifa group.
The violence culminated when a man plowed his car into a crowd of counter-protesters, killing a woman named Heather Heyer and injuring 19.
On Saturday, marchers in Charlottesville held peaceful demonstrations and people laid flowers on a makeshift memorial to Heyer.
Blame on 'both sides'
President Donald Trump was roundly condemned last year for saying there was "blame on both sides" for the violence, condemning the anti-fascists who came "with clubs in their hands."
Two days later, after a firestorm of criticism, the president said: "Racism is evil and those who cause violence in its name are criminals and thugs, including the KKK, neo-Nazis, white supremacists, and other hate groups."
On Saturday the president issued a generic condemnation of racism via Twitter.
"The riots in Charlottesville a year ago resulted in senseless death and division," he wrote. "We must come together as a nation. I condemn all types of racism and acts of violence. Peace to ALL Americans!"
Trump's daughter Ivanka, a White House aide, was more explicit in her condemnation of the "ugly display of hatred, racism, bigotry & violence" last year at Charlottesville.
"There is no place for white supremacy, racism and neo-nazism in our great country," she tweeted.
"Rather than tearing each other down with hatred, racism & violence, we can lift one another up, strengthen our communities and strive to help every American achieve his or her full potential!"
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