According to John Oliver, there's only one way for Donald Trump to salvage some of his reputation at this point in the US presidential race - drop out.

The Last Week Tonight host put forward his solution during Sunday night's segment, arguing it is the only way to save his brand - a brand built on winning.

"Mr Trump, Donny, Doniel," he said, addressing the Republican presidential candidate directly.

"Drop out. Simply drop out and tell America this entire candidacy was a stunt - a satire designed to expose the flaws in the system.

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"And the thing is you could actually make a fairly decent case for that."

The comedian then proceeded to put forward a pretty convincing case for Trump, an alternative to a "humiliating" and "off-brand" loss to Hillary Clinton, or a complete "reset" of his campaign.

"Just think about how triumphant it would feel to say on national television: 'I openly ran on a platform of impossibly ignorant proposals steeped in racial bigotry and nobody stopped me. In fact, you embraced me for it. What the f*ck was that about?'

"If you drop out in order to teach America a lesson, you would not be a loser, you would be a legend. There'd be a federal holiday in your honour," Oliver declared.

He even predicted it would be "one of the most powerful political speeches of all time."

With a little help from comedian Will Arnett, Oliver presents Trump with an instruction manual for dropping out - in the form of a children's book called The Kid Who Ran for President, about a 12-year-old boy who runs for president as a joke.

Oliver ends by boldly challenging Trump to stop by his studio, appear on the show, and resign from the race.

"Please, prove me wrong and reveal yourself to be a three-bit bullsh*t artist, conning America to help America," he said.