Mary Trump has provided her uncle’s election opponent with some advice on how to wind-up the president during the 2020 presidential debates.
“First of all, and I mean this sincerely, I hope vice president Biden refers to Donald as Donald,” said Ms Trump. “Just because that’s an easy way to get under his skin.
“Nobody’s disrespected the office as much as Donald has, so he doesn’t deserve the cover of the respect of the office of the presidency,” she added.
The 55-year-old, who released a tell-all book about her uncle in July titled “Too Much and Never Enough: How My Family Created The World’s Most Dangerous Man,” also suggested Mr Biden make sure the moderators call-out Mr Trump's lies.
“Even if it feels rude, even if it feels like he’s interrupting, it’s too important for us to sit on ceremony here,” she said.
Thursday’s interview was the latest given by the president’s niece since the publication of her book.
She told CNN earlier this week that Mr Trump was growing desperate to improve his reelection chances, having falsely accused Mr Biden of using drugs.
"He projects about almost everything," she said of her uncle. "Normalising him — which has been going on for decade — is one of the reasons we're here."
It’s "desperation”, she added. "He's grasping at straws at the moment."
According to analysis by The Washington Post, Mr Trump has told more than 20,000 lies during his time as president.
His niece has since compared the president’s lies to “almost like breathing” for him.
The first televised 2020 presidential debate between Mr Trump and Mr Biden takes place in Cleveland on 29 September, with Fox News’ Chris Wallace as moderator. .
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