Mocking the idea of the Democrat trying to make a decision, Mr Trump held his arms tightly against his body while repeatedly jerking his right shoulder upwards as if he was stopping himself from raising his hand.
As some in the crowd laughed, Mr Trump said: “Everyone else raised their hands … and Joe you could see, ‘cause for 47 years he’s had the itch … he knows this isn’t going to work.”
The he pointed to his brain and said ‘You know there is still something left, not much.”
The impersonation was reminiscent of Mr Trump’s notorious mocking of Serge Kovaleski, a New York Times reporter who is disabled, at a rally in South Carolina in 2015.
Mr Trump also got huge cheers on Wednesday night as he put on a red MAGA cap to prevent the wind messing up his hair, and even took his tie off.
“Oh that’s better,” said Mr Trump as the tie came off.
“It’s windy out here, if you can wear the hat then I can wear the hat.”
Mr Trump also got Olympic gold medal wrestler Dan Gable, 71, up on stage to announce he will receive the Presidential Medal of Freedom.
“I’m immune, I can’t give it to you, so that’s good,” said Mr Trump about the coronavirus as he called him up. The president has repeatedly claimed to be immune now that he has survived Covid-19, although doctors have pointed out that several people have suffered a second infection. This week reports from the Netherlands said a patient had died from a second bout of coronavirus.
Mr Trump also spent more than seven minutes attacking Mr Biden and his son Hunter’s business dealings in Ukraine.
The president branded Mr Biden a “corrupt politician” who had engaged in “pay-for-play” politics as the vice president.
Mr Trump even said that his rival for the White House should not be allowed to run for the presidency because of it.
“Vice President Biden, you owe the American people an apology because … you are a corrupt politician,” said Mr Trump.
His new attack lines stem from a controversial report in the New York Post which Facebook and Twitter applied restrictions to, saying they were aiming to slow the spread of false information. However, the tech giants were accused by figures on the right of censorship after preventing users from sharing the story, which revolves around a laptop that may have belonged to Hunter Biden that was supposedly left in a repair shop.