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US President Joe Biden "comes across as a fossil" and Donald Trump would have the energy to beat him in a 2024 showdown, according to president Trump's former senior adviser Jason Miller.

Former US president Donald Trump officially launched his 2024 presidential campaign on November 15.

Mr Miller addressed criticisms that Mr Trump's announcement was "low energy" by his usual standards.

"Well he was gonna get hit no matter what he did," Mr Miller told Sky News Australia host Piers Morgan.

"As far as the energy goes, keep in mind it's not just in a vacuum – he's going against Joe Biden – who comes across as a fossil, a skeleton at best."