He posted: "The riots in Charlottesville a year ago resulted in senseless death and division".
"We must come together as a nation", Trump wrote on Twitter from his golf club in New Jersey.
President Trump urges peace for all Americans one year after the deadly incidents in Charlottesville.
Trump's tweet Saturday, his first public mention of the anniversary, did not label the event as a white supremacist rally or specify that it was a white rallygoer who rammed his vehicle into a crowd of counterprotesters, killing one.
The mother of Heather Heyer, who died past year when a white nationalist slammed his vehicle into counter-protesters in Charlottesville, has urged people to stay peaceful as Washington DC readies itself for Unite the Right 2.
Two Virginia state troopers who were monitoring the rally were later killed in the line of duty when their helicopter crashed.
Ivanka Trump and her husband reportedly pressured her father to single out white supremacists and neo-Nazis immediately after the violence a year ago, and he did - and then reversed himself within a day, once again blaming both sides.
Several memorial events are planned in Charlottesville, where a counterprotester to a Unite the Right rally was killed when a driver barreled into a group walking on the street.
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In Lafayette Square, where the white supremacists plan to rally, counterdemonstrators gathered in the early afternoon as music played and speakers talked about the importance of their protest, as NPR's Tim Mak reported.
The former governor explained the situation to the president that day, but Trump's response was markedly different, as he avoided any meaningful condemnation of the racism that was clearly at play. I think last year's eruption - that infection gives us a little better understanding of how bad it is so that we can gradually, slowly and difficultly heal. But scuffles continued, and the violence culminated when a vehicle plowed into a group of counterprotesters, killing 32-year-old Heather Heyer.
Organizer: The event was organized by Jason Kessler, who already had last year's rally on his resume. "We're talking about issues that have been going on here for centuries", Walker said.
Numerous protesters directed their anger at the heavy police presence, with chants like "cops and Klan go hand in hand", a year after police were harshly criticized for their failure to prevent the violence.
Counter protesters who held signs declaring "No Hate" awaited their arrival, chanting "Nazis go home" and "Shut it down".
"I'm not a white supremacist, I'm not even a white nationalist", Kessler told NPR.
He continued: "What about the "alt-left" that came charging at, as you say, the 'alt-right, ' do they have any semblance of guilt?", he said.
And the "Rise Up Fight Back Counter-Protest" hosted by Black Lives Matter DC is due to take place between 2 and 7 p.m. Sunday, a block away from the "Unite the Right 2" rally.