"I went through it and now they say I'm immune," Trump told a cheering crowd in Sanford, near Orlando, few of whom wore masks. 

"I feel so powerful. I'll walk in there, I'll kiss everyone in that audience. I'll kiss the guys and the beautiful women, just give you a big fat kiss."

Trump's medical team announced he had tested negative and was no longer contagious as he jetted to Florida - the first of four battleground states he plans to visit over the next four days. His claim of immunity is unproven.

Trailing his Democratic challenger by double digits in the polls, Trump is seeking to rally his base on a blitz of key swing states.

In rare form just a week after his release from hospital, Trump's hour-long speech called on all of his campaign classics: vicious attacks against "Crooked Hillary" Clinton and the "corrupt" press, alarmist warnings against the "radical left" and the "socialist nightmare."

Trump also mocked his opponent, whom he has nicknamed "Sleepy Joe," saying that "practically nobody showed up" to Biden's campaign event.

Unlike Trump, Biden has been following public health guidelines during the pandemic, hosting socially-distanced campaign events that sharply contrast with Trump's packed, largely maskless extravaganzas - including a recent celebration at the White House described by experts as a "superspreader."

"Oh, do I like Florida," Trump told the crowd. The state could play a crucial role on Nov.3.

The president brushed aside poll numbers, saying: "Four years ago we had the same thing. We are going to lose Florida, they said four years ago."

"Twenty-two days from now, we are going to win this state, we are going to win four more years in the White House!" he added.

He also lauded his nominee for Supreme Court justice, Amy Coney Barrett.

The Republican-controled Senate will begin hearings for the 48-year-old judge, whose confirmation -- over which there is little doubt - will shift the nation's highest court firmly to the right, possibly for generations.

"She's going to be a fantastic US Supreme Court Justice," Trump said.

"Who would have thought we're on number three, you know?" he asked, referring to the justices he has appointed to the court since taking office.

Before Trump, 74, left for Florida, his physician Sean Conley said the president was now negative and no longer "infectious to others" - following consecutive rapid tests and taking into account a number of other health metrics.

Patients are normally classed as negative only after taking the more sensitive PCR test - drawing suspicion from experts on social media that Trump's doctors had administered these but had not received the results they were looking for. 

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