Donald Trump has mocked Joe Biden's golf swing, speaking style, and walk almost a week after he dropped out of the presidential race.
The former president eventually turned his attention to his new opponent Kamala Harris at a rally in key swing state Minnesota on Saturday night.
Trump revved up the 8,000-strong crowd in St Cloud with his impressions of the president, and called Harris 'Marxist' and 'evil' for her immigration record.
'I don't wanna waste a lot of time because it's over now, right, he's gone, I told you he would be, I told you he wasn't going to make it,' he said of Biden.
But instead he spent huge chunks of his more than an hour-long speech attacking Biden, despite no longer running against him.
Trump referenced his and Biden's bizarre bickering about their golf handicaps during the debate, and claimed the president challenged him to a game.
'Joe Biden, I watched him - I was always a good athlete but I don't wanna brag - Joe Biden challenged me to a round of golf,' he claimed.
Trump then stepped away from the lectern and mimed a series of terrible swings to mock Biden's golf ability.
The former president claimed he offered Biden $1 million if he could score less than 100 on a round of golf, and that Biden turned him down.
'He said he was a six (handicap) right, during the debate, and then immediately he said he was an eight, I said 'that was quick, we keep going like this he'll be a 30 in about two minutes',' he said.
Trump also made fun of Biden's gingerly walks from stage, slow shuffles down stairs, and one time when he went to the wrong side of a stage to the stairs.
He complained his frequent mockery of Biden was taken out of context as someone told him they heard he couldn't find the stairs at a rally.
'I was playing and having fun imitating Joe Biden not being able to find the stairs, and they said that Trump couldn't find the stairs off the stage,' he said.
'Tonight I'll have a very bad night, I haven't done that little routine in a long time because of that.
'I can find the stairs, I'll let you know when it's my time not to find the stairs... I'll say it's time to go, nobody's going to have to tell me.'
When Trump moved on to Harris, he viciously attacked her as a 'radical left lunatic' and claimed 'defund the police, that was her big thing'.
'She was thought of so badly they were just killing her and now that she's in the position they're trying to make her, let's say a Margaret Thatcher,' he said
'I don't think so, that's not going to happen. Thatcher didn't laugh like that, did she?'
Thatcher was UK prime minister from 1979 to 1990 and nicknamed the 'Iron Lady' for her strong will and political longevity.
'Kamala Harris was the original Marxist district attorney she destroyed San Francisco and she will destroy our country, she will be the worst president we've ever had, she will be worse than Crooked Joe Biden,' Trump continued.
Trump was particularly critical of Harris on immigration, saying she was Biden's 'border czar' during the immigration crisis of the past two years.
'She has no clue, she's evil,' he said, in one of at least two times in the rally he referred to Harris as 'evil'.
'Under border czar, millions of migrants are pouring across our border, they're coming not just from South America - they're coming form Africa, from Asia, the Middle East, they're coming from everywhere,' he claimed.
Trump has frequently pushed a false claim that Latin American countries are deliberately sending criminals and mentally ill citizens to the US, and repeated it in an attack on Harris.
'They're coming form prisons and jails, mental institutions, insane asylums, terrorists at levels that we've never seen before,' he said.
'They're taking their criminals and they're dumping them, we're like a dumping ground. So in Venezuela, the crime is way down, it's almost gone, the jails are half empty.'
