Bulk of Trump Supporters Would Back Third-Party Bid

Nineteen percent of respondents in the poll overall said they would definitely or probably vote for him if he ran third-party in a general election.

US billionaire Donald Trump (C) is pictured as he arrives at the Women's British Open Golf Championships in Turnberry, Scotland, on July 30, 2015.

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Donald Trump could take a major chunk of his support with him to a third-party bid if the Republican Party ultimately fires him in the presidential nomination race, a Bloomberg Politics poll shows.

The national survey, conducted ahead of Thursday's first presidential debate, shows almost two-thirds of registered voters who identify as Republican and back the billionaire would definitely or probably support him in a third-party bid.