Trump chided incumbent US leader Joe Biden for "shaking hands in the air."

“This happens when Putin constantly talks about nuclear weapons.

Nobody has ever talked about nuclear weapons, you should not talk about it, ”RIA Novosti quotes him as speaking to supporters during a rally in Nebraska.

According to Trump, these words are taboo because of their "destructiveness".

“Putin talks about him all the time because he does not respect our leadership,” the former American leader said.

Trump also said that Biden has done more harm to the United States than the five worst presidents of the United States combined.