US President Donald Trump has promised a major autism-related announcement from the White House on Monday US time.

The revelation came with Trump onstage in Arizona, where he paid tribute to slain right-wing activist Charlie Kirk in a lengthy speech.

At one point he deviated to promise "one of the biggest announcement really, medically, I think in the history of our country".

"We're going to be doing it with Bobby (Secretary of Health Robert F Kennedy Jr) and Oz (Administrator of the Centres of Medicare and Medicaid Services Mehmet Oz) and all of the professionals," he said.

"I think you're going to find it to be amazing. I think we found an answer to autism.

"How about that?"

He said it was likely to be "one of the most important news conferences I'll ever have".

"We're goi

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