Intrigue builds over Yang debate promise

Intrigue builds over Yang debate promise
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Presidential candidate Andrew YangAndrew YangO'Rourke campaign says path to victory hinges on top 5 finishes in Iowa, Nevada Hillicon Valley: Google, Reddit to testify on tech industry protections | Trump joins Amazon-owned Twitch | House to vote on bill to combat foreign interference O'Rourke raises .5 million in third quarter MORE promised he will do something "big" and "unprecedented" while on the debate stage Thursday. 

A senior campaign official told NBC News that the Democratic presidential candidate has a surprise planned for the debate but would not reveal what it was.

Yang will take the stage along with nine other candidates, including former Vice President Joe BidenJoe BidenTrump hits Fox News's Chris Wallace over Ukraine coverage Schiff: Whistleblower testimony might not be necessary Trump warns Democrats will lose House seats over impeachment MORE, Sen. Bernie SandersBernie SandersSanders wishes Ocasio-Cortez happy birthday Video of fake Trump shooting members of media shown at his Miami resort: report Sanders can gain ground by zeroing in on corruption MORE (I-Vt.) and Sen. Elizabeth WarrenElizabeth Ann WarrenSanders can gain ground by zeroing in on corruption Biden praises Buttigieg for criticizing GOP attacks: 'That's a good man' Warren enters crucial debate with big momentum MORE (D-Mass.) who have been leading the polls.

The businessman has been joining the fun on Twitter as people speculate what the candidate is up to, hinting about wearing crowdsurfing sandals and tweeting that "ninja-style headwear makes everything cooler."

He also replied on Twitter to a statement from Trevor NoahTrevor Noah'Daily Show' hotline offering 'perfect call' with Trump gets more than 35K callers in less than a day Intrigue builds over Yang debate promise De Blasio touts height as reason he can beat Trump: 'The tall candidate almost always wins' MORE in a "The Daily Show" video, where the comedian said Yang will "have to keep escalating your stunts."

Yang responded, "Don't worry @Trevornoah, we've got something big in store! @TheDailyShow #StayTuned #DemDebate."

The promise has sparked a wide variety of theories on what the surprise could be.

A spokesman from the Yang campaign confirmed the announcement will be in the opener.

Yang has been receiving increased attention and higher polling numbers in the past week. He also said earlier this week that he would "school" President TrumpDonald John TrumpWHCA calls on Trump to denounce video depicting him shooting media outlets Video of fake Trump shooting members of media shown at his Miami resort: report Trump hits Fox News's Chris Wallace over Ukraine coverage MORE in a one-on-one basketball game.