Trump campaign officials declined to provide details about the reason the campaign has declined to pay the sum to Fabrizio Lee, the pollster's Fort Lauderdale, Fla.-based firm. “This is an administrative issue that we're resolving internally,” said senior communications adviser Jason Miller. Fabrizio did not immediately respond to requests for comment.

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What Donald Trump is doing on the campaign trail share Share View Photos View Photos Next Image MANCHESTER, NH - NOVEMBER 7: Republican presidential candidate Donald Trump speaks during a campaign event at SNHU Arena in Manchester, NH on Monday November 07, 2016. (Jabin Botsford/The Washington Post)

Trump has repeatedly been accused of failing to pay vendors and contractors hired by his real estate empire, including painters, dish washers, real estate brokers and a music store that provided pianos for his Taj Mahal casino in Atlantic City. The billionaire has said he pays fairly and that he has withheld payments only when he was dissatisfied with someone's services.

Fabrizio was an ally of former campaign chairman Paul Manafort, who persuaded a skeptical Trump in the spring that he needed a professional pollster. The abrupt departure of Manafort in August and Trump's hiring of pollster Kellyanne Conway to be his campaign manager raised questions about whether Fabrizio would stay on. There have also been multiple reports that Trump and his son-in-law, Jared Kushner, have rejected Fabrizio's advice.

Even though he was hired in May, the campaign did not make any payments to Fabrizio until September, when his firm received nearly $624,000, federal filings show. Trump's finance reports show that the campaign owes the firm an additional $55,300 on top of the $766,756.67 in debt that it is contesting.

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Fabrizio’s polling firm has also been paid by the Committee on Arrangements for the 2016 Republican National Convention, which gave it $273,378 in July, federal filings show.

Despite his issues with Fabrizio, Trump appears to have warmed up to pollsters in general. Since late August, the GOP nominee has tapped four other polling firms to conduct voter surveys, including Conway's, which has been paid $673,000 through Oct. 19, filings show.

Anu Narayanswamy contributed to this report.