US President Trump called on Biden to undergo drug testing before Tuesday's presidential election debate.Although Trump has no evidence, Biden's recent public appearance was questioned by the media about his drug abuse.

The day before yesterday, Biden was interviewed by the US media on television. He talked about being suddenly stuck in the middle, then his words were incoherent. Finally, after being reminded by the host, Biden remembered what he wanted to say, and the interview was able to continue. In response, Trump tweeted on his way to a private golf club in Virginia that he hoped everyone would do a drug test before the debate.

This isn't the first time Trump has proposed drug tests. Last monthTrump said that the level of debate between Biden during the Democratic primary election improved dramatically; it was simply a matter of two people.As a result, Trump suspected that rival Biden was taking drugs.