Trump tips food delivery driver $140 for McDonald's order

US President Donald Trump has tipped a food delivery driver at the White House in a televised moment he used to plug his tax policies.

DoorDash delivery driver Sharon Simmons handed Trump an order from McDonald's before he invited her to talk to reporters about tax breaks on tips for workers, reports CBS.

Simmons, a grandmother who was making her first White House delivery, said the "no tax on tips" policy has been a financial boost at a time when her husband was ill with cancer.

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She said the "no tax on tips" policy, which enables workers to keep more of their tips, gave her $11,000 more than she would have earned otherwise.

Trump described the policy as "very special", which Simmons agreed with.

She was less forthcoming when Trump asked her: "And I think you voted for me, do you think?"

"Um, maybe," Simmons replied.

"I heard you're a great supporter, we appreciate it," Trump said.

When Trump began taking questions from reporters, one asked SImmons whether the White House tipped well.

Um," she smiled, "potentially."

"Great," Trump replied, handing her US$100 ($140) cash.

"Yes, very," Simmons said.

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