'We can't kid anymore': Donald Trump mocks ‘crooked Joe Biden’ during 78th birthday speech

Former US President Donald Trump has warned supporters not to joke with Democrats during his 78th birthday speech, recounting an occasion he was taken seriously for walking into a wall when he was really just mocking Joe Biden.

Mr Trump addressed supporters at his 78th birthday event in Palm Beach, Florida, Friday night local time.

“We can’t be sarcastic anymore because they take it as the truth,” Trump said.

“We can’t kid anymore because these people are so dishonest.

“I said I was just imitating crooked Joe Biden, she said 'well they didn’t say that they just showed you running into walls'.”

The Republican nominee’s age now puts him on par with sitting President Joe Biden to be the oldest person ever to be inaugurated if he wins the 2024 US election.