'Should I be insulted or happy?' after Biden called Trump George.

Donald Trump has mocked 'Sleepy' Joe Biden for forgetting who was president after the Democrat candidate said 'we need to stop four more years of George.'

Biden was a virtual concert when he said: 'Four more years of George, er, George, er, he - we're going to find ourselves in a position where, if Trump gets elected, we're going to be in a different world.'

The 77-year-old appeared to receive a prompt from his wife Jill who was sitting beside him, muttering 'Trump' under her breath.

The president mocked his rival "Sleepy Joe," as he highlighted the gaffe where Biden referred to him as "George."

"What a mess! What a mess. No, he called me George. I don't know if I should be insulted or happy about it. I'm sort of insulted. That's the first time that's happened to me in a long time," he said.

Biden, born in Pennsylvania, has made a victory in the state a critical part of his own strategy. Trump told reporters he expects to win Pennsylvania by a larger margin than the narrow one he achieved in defeating Democrat Hillary Clinton in 2016.

Biden was expected to remain in his home state of Delaware on Monday. He is scheduled to travel to Georgia on Tuesday, with stops in Atlanta and Warm Springs, and Florida on Thursday, with stops in Broward County and Tampa.

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