Donald Trump. Photo: Gage Skidmore.

Washington Post – Republican presidential front-runner Donald Trump abruptly announced here Tuesday that he would not participate in Thursday’s scheduled debate, escalating his off-and-on feud with Fox News Channel and throwing the GOP campaign into turmoil.

Trump’s assertion, which his campaign manager insisted was irreversible, came less than one week before the kickoff Iowa caucuses. He once again defied the conventional rules of politics, and used his power and prominence to shape the campaign agenda and conversation.

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