Hilarious moment Donald Trump lets Tonight Show host Jimmy Fallon mess up his perfectly preened hairdo on national TV

DONALD Trump's famous yellow hair, which has become one of the enigmas of the US presidential race, got messed up when he appeared on Jimmy Fallon's The Tonight Show last night.

TV host Fallon, who did his very popular impression of Trump's speaking style, ribbed him right and left, concluded his interview with a bizarre request.

"Can I mess up your hair?" he asked.

Fallon explained it could be the last time he could ask to do something "unpresidential" with Trump if he wins the election in November against rival Hillary Clinton.

The audience went nuts over the idea so the usually brash presidential candidate played the good sport and agreed to it.

"The answer is yes, but... I hope the people of New Hampshire... will understand," Trump said.

The 70-year-old, who had an elaborate hair-do centered on what seemed to be an ambitious comb-over, explained he was heading there later that night and didn't want his coiffure out of place.

So Fallon reached out with his hand and ruffled Trump's hair with a vigorous, repeated rub as the Republican nominee endured it with a broad smile.

And the result was not pretty as Trump's long locks ended up pointing messily in every direction.

Trump tried to push his hair back in place - but it resisted.

During his appearance, Fallon dubbed Trump's bromance with Vladimir Putin as "Vlump" and asked him about his penchant for eating fast food.

"At least you know what you're getting," Trump said. He added that if he went to an unknown place, "If they don't like me ... I don't know. I'm better off with fast food."
Fallon also thanked Trump for providing what he described as grist for so much comic material.

"You say some shocking things," Fallon said.

"But I'm trying not to anymore," Trump replied.