Biden made the claim while he was a presidential candidate in 2020; he provided no proof for the label.
“It’s actual malice, defaming my character for him to say something like that,” Rittenhouse told Fox News’ Tucker Carlson.
It was the first time the teen has responded to the claim.
The term actual malice refers to a legal standard set by the Supreme Court for libel cases in which public figures can win damages, according to the Free Speech Center at Middle Tennessee State University.
Various lawyers have said Rittenhouse could sue Biden and others for defamation, and the teen suggested that may happen.
“I have really good lawyers who are taking care of that right now. So, I’m hoping, one day, there will be accountability for their actions,” he said.
The White House hasn’t responded to requests for comment on Biden’s claim.
Rittenhouse shot three men in Kenosha, Wisconsin, on Aug. 25, 2020. He was acquitted on all charges last week, successfully making the case that he was acting in self-defense. Video footage and testimony showed the men each attacked or were advancing toward him when they were shot.
Biden’s claim came in a Twitter post from his official account. He was criticizing then-President Donald Trump, alleging Trump “refused to disavow white supremacists” during a debate they took part in the night prior.
A video attached to the tweet showed people during the Unite the Right rally in Charlottesville, Virginia, as well as Rittenhouse in Kenosha.
“When I saw that I was shocked. I was angry,” Wendy Rittenhouse, Rittenhouse’s mother, told Fox earlier this month.
“He did that for the votes, and I was so angry for a while at him and what he did to my son—he defamed him,” she added.
Neither Biden nor officials speaking for him have ever addressed his description of the teenager.
Confronted with the comment during a press briefing last week, White House press secretary Jen Psaki said she wouldn’t address it. During the answer, she seemed to describe Rittenhouse as a vigilante.
“What I’m not going to speak to right now is anything about an ongoing trial nor the president’s past comments. What I can reiterate for you is the president’s view that we shouldn’t have, broadly speaking, vigilantes patrolling our communities with assault weapons. We shouldn’t have opportunists corrupting peaceful protests by rioting and burning down the communities they claim to represent anywhere in the country,” Psaki said.
Biden told reporters after Rittenhouse was acquitted that he didn’t watch the trial but “stood by what the jury has concluded.” In a written statement released by the White House, Biden said he was “angry and concerned” by the verdict but called for calm because “the jury has spoken.”
Rittenhouse addressed Biden directly during the interview, urging him to acquaint himself with what unfolded during the trial.
“Mr. President, if I could say one thing to you, I would urge you to go back and watch the trial and understand the facts before you make a statement,” he said.
Jack Phillips contributed to this report.