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In professional wrestling, a face is a heroic, "good guy" or "fan favorite" wrestler, booked by the promotion with the aim of being cheered by fans. Traditionally, they wrestle within the rules and avoid cheating while behaving positively towards the referee and the audience.

In professional wrestling, a heel is a wrestler who portrays a villain, "bad guy" or "rulebreaker" and acts as an antagonist to the faces, who are the heroic protagonist or "good guy" characters.

Could Donald Trump be a secret double-agent, sent by Democrats to destroy their party from within?

Former Florida governor Jeb Bush, who has borne the brunt of more than a few Trump barbs, seems to think there's a possibility.

"Maybe Donald negotiated a deal with his buddy Hillary Clinton," Mr Bush tweeted this week, after Mr Trump cited a poll showing his supporters would stick with him if he left the Republican Party. "Continuing this path will put her in the White House."

The New York billionaire has a spotty political history, at best. He was a Republican, then he was a pro-choice Democrat, and now he's a fire-breathing, anti-immigration populist conservative.

Could this latest iteration of Mr Trump's political brand be just a ruse, the elaborate cover for a liberal saboteur who has spent the past year setting explosives that threaten the unity of the party he pledged to support?

"If Donald Trump were a Democratic mole placed in the Republican Party to disrupt things, how would his behaviour be any different?" asked conservative political commentator George Will in July. "I don't think it would be."

"Mr Trump has a close friendship with Bill and Hillary Clinton," he said. "They were at his last wedding. He has contributed to the Clintons' foundation. He has contributed to Mrs Clinton's Senate campaigns. All of this is very suspicious."

Also suspicious - for those predisposed to suspicion, at least - is a "mystery" phone call between Mr Trump and Bill Clinton in May, less than a month before the real-estate tycoon tossed his hat into the presidential ring.

"Clinton encouraged Trump's efforts to play a larger role in the Republican Party and offered his own views of the political landscape," the Washington Post reported at the time.

"Trump didn't jump into this race because of his deep abiding love for America, or his being a Republican or caring about conservatism," he writes. "Trump jumped into this race because BILL CLINTON urged him to."