On Thursday night, Wendy Rittenhouse spoke hours after the defense rested its case in the high-profile trial.
Her 18-year-old son is charged with murdering two people and wounding a third during the rioting in Kenosha, Wisconsin, following the police shooting of Jacob Blake.
His lawyers insist Rittenhouse was acting in self defense, and on Monday, both sides are expected to sum up their arguments before the jury retires for deliberations.
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Wendy, a mother of three, told Fox News's Sean Hannity that she was still angry with Biden for labeling her son a White supremacist last year.
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Biden's campaign team included footage of Rittenhouse alongside neo-Nazis parading the streets in a bid to undermine support for his rival, former President Trump.
During a presidential debate, Trump refused to condemn the Proud Boys, in response to which Biden tweeted a still of the campaign video - showing Rittenhouse - with the caption: 'There's no other way to put it: the President of the United States refused to disavow White supremacists on the debate stage last night.'
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Wendy told Hannity: 'When I saw that, I wasn't shocked. I was angry.
'President Biden doesn't know my son whatsoever.
'He's not a white supremacist, he's not a racist.
'He did that for the votes and for a while I was so angry at him.
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'And what he did for my son - he defamed him.'
But she said she was optimistic the jury would come to the right decision.
'The judge is very fair,' she declared.
'People that I talk to who have lived in Kenosha all their lives say Judge Schroeder is a very fair judge, and he does not allow any nonsense in his courtroom.'
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The trial, which began on November 2, has been noted for clashes between Judge Bruce Schroeder - 75 years old and the longest-serving circuit court judge in the state - and Thomas Binger, prosecutor.
Wendy said she felt the jury was taking everything very seriously.
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'With a jury, they have been keeping a close eye on every evidence, every testimony, and they are paying good attention to what was said. That's the truth,' she told Hannity.
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She admitted that sitting in the courtroom every day has been harrowing and broke down in tears when she described watching the video of the violent unrest in Kenosha.
'I was scared, I was frightened,' she said.
'I thought my son was going to die that night.
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'When I look at the video with that guy pointing a gun to my son's head I thought he was going to die. This guy just pointed a gun at his head.
'And it took a long time to... just to grasp that he was alive.
'I'm grateful and I'm relieved that he's OK.
'But he has a lot of healing to do.'
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