Trump supporters allegedly contributed to the delay in Democratic Iowa caucus results by flooding a hotline used by precinct chairs to report votes for presidential candidates.

The calls came after the phone number was made public when photos of caucuses paperwork were reportedly published online.

The claim was made by a senior Iowa Democrat during a conference call with national party leaders on Wednesday evening, according to Bloomberg News.

The news agency, which is owned by Democratic presidential candidate Michael Bloomberg, reported the Iowa Democrat was one of the officials answering the hotline when Trump supporters were calling in to express support for the president.

The conference call came amid continued confusion over the final results of the Iowa caucuses, which is the opening state-wide contest in a months-long national voting process to choose which Democrat will take on Donald Trump in the November presidential election.

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The race remained too early to call early on Thursday, with 97 per cent of precincts reporting. But Pete Buttigieg and Bernie Sanders were nearly tied in Iowa, in a contest marred by technical issues and reporting delays beyond the hotline issue.

Party officials were still scrambling to verify the remaining results three days after Iowans gathered at caucus sites across the state.

A new batch of results released just after midnight narrowed the margin between Mr Buttigieg, the former mayor of South Bend, Indiana, and Mr Sanders, the progressive senator from Vermont. Mr Buttigieg has a lead of three state delegate equivalents out of 2,098 counted.

The deadlocked contest gives both Mr Buttigieg and Mr Sanders a burst of momentum as they seek to pull away from the crowded field. The nearly complete results show them leading Massachusetts senator Elizabeth Warren, with former vice-president Joe Biden and senator Amy Klobuchar trailing behind.

But the results in Iowa were muddied by the stunning breakdown of the caucus reporting process in a state that traditionally kicks off presidential nominating contests. Iowa officials initially attributed a delay in reporting results to technical problems with an app that precinct chairs were supposed to use to record votes, then to backlogs as those volunteers tried to call the party to submit their totals.

Even as the total number of results ticked up throughout the day on Wednesday, obstacles remained. Some tally sheets were making their way to party headquarters in Des Moines through the mail, which contributed to the delay.

Much of the political world has already shifted its attention to next-up New Hampshire, which holds the first primary election in the Democrats’ 2020 nomination fight on Tuesday. Both Mr Buttigieg and Mr Sanders are leading contenders there, as well.

Iowa voter asks to change vote after learning Pete Buttigieg is gay

The two men are separated by 40 years in age and conflicting ideology.

Mr Sanders, a 78-year-old self-described democratic socialist, has been a progressive powerhouse for decades. Mr Buttigieg, a 38-year-old former municipal official, represents the more moderate wing of the Democratic Party. Mr Buttigieg is also the first openly gay candidate to earn presidential primary delegates.

Their strength in Iowa put them in the crosshairs of rivals as the race shifted to New Hampshire. Mr Biden, who fell far short of expectations in Iowa, cast both Mr Buttigieg and Mr Sanders as risky choices for Democrats, given the former mayor’s relative inexperience and the senator’s descriptions of himself as a socialist.

Mr Sanders is making his second run for the White House. He surprised many Democrats in 2016 with his strong challenge to Hillary Clinton, but entered the 2020 contest as a frontrunner. He’s topped the field in fundraising, despite eschewing high-dollar donors.

Mr Sanders and his supporters raised issues with the primary process after the 2016 election, prompting the Democratic National Committee to make changes that affected the Iowa reporting regulations.

As a result, Iowa released three sets of data from the caucuses: the tally of voter preferences at the start of the caucus; their preferences after supporters of candidates who reached less than 15 per cent made a second choice; and the results of state delegate equivalents.

The final alignment results are used to determine state delegate equivalents, which is the metric the AP has long used to call the winner of the caucus. Democrats pick their nominee based on delegate totals.

With 97 per cent of precincts reporting, Mr Sanders is leading in the first alignment results and has a narrower edge in the final alignment.