Since Biden is taking heat for saying he doesn't remember, let us take a look at all the times Trump said he doesn't remember:
In written responses under oath, the president said his memory of crucial questions was hazy.
www.marketwatch.com
President Trump has claimed that he has “one of the world’s greatest memories,” but that failed him repeatedly when answering questions from Robert Mueller.
www.nytimes.com
He cited memory lapses 59 times during the December deposition, a transcript from which was released on Wednesday.
www.nbcnews.com
Trump often distances himself from negative headlines or other criticism by claiming he doesn't know his critics – even when evidence shows otherwise.
www.usatoday.com
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Next to Donald Trump, Joe Biden is Harry Lorayne.
Donald Trump's mind is mush.