In an August 26, 2020 interview with The Washington Examiner, Trump claimed without evidence that his Democrat opponent for the 2020 election was taking performance-enhancing drugs.
He repeated the claim in a September 11, 2020 interview on Fox News.
He has also called for Biden to be tested for drugs on Twitter.
Trump repeatedly accused Biden of being mentally incompetent, while bragging about his own completion of a basic cognitive exam.
The Washington Examiner – Trump calls for drug tests before Biden debate
Forbes – Trump’s Latest Trolling Of Biden’s Mental State: Calling For Drug Tests Before Debates
Business Insider – President Trump baselessly accuses Biden of taking performance-enhancing drugs during primary debates