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Iowa caucus live updates: Buttigieg, Sanders reach virtual tie with 100 percent of results released

The first-in-the-nation voting state was thrown into disarray late Monday after the Iowa Democratic Party delayed releasing results.

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The Iowa Democratic Party announced the release of 100 percent of the state caucus results Thursday night, showing Pete Buttigieg and Bernie Sanders neck and neck in their lead over the rest of the Democratic candidates. The results could change as more data is examined, and NBC has not called a winner in the race.

The Iowa Democrats' announcement comes after Democratic National Committee Chair Tom Perez called on state party officials to recanvass the results of Monday's caucuses amid growing concerns about their accuracy (see NBC News' review of the results).

Caucusgoers gathered at nearly 1,700 sites across Iowa on Monday night to tally support for their preferred candidates only for the count to be thrown into disarray when what Iowa Democrats called "inconsistencies" delayed the reporting of results.

The state has 41 pledged delegates up for grabs, and the high-stakes contest traditionally plays a major role in determining who is a legitimate contender in the race. Candidates in the crowded Democratic field needed to meet a threshold of support (at least 15 percent of attendees at most caucus sites) to become viable, or they saw supporters move on to someone else.

Highlights from the Iowa caucuses

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Iowa Democrats say Trump supporters called into vote counting hotline, causing them more problems

An Iowa Democratic Party official told NBC News that as it experienced "an unusually high volume of inbound phone calls to its caucus hotline" after an app created to reported results had faltered Monday night, including from "supporters of President [Donald] Trump."

Iowa precinct chairs had to use that hotline to report vote tallies following mishaps with the app, but many were met with lengthy wait times in order to get through. That phone number was posted online, worsening the problem.

Trump supporters calling the hotline was first reported by Bloomberg News.

Iowa Democrats did not respond to NBC News' requests for information on how many individuals manned the phone lines Monday night. The Trump campaign did not immediately respond to a request for comment.

"At the outset of boiler room operations on February 3rd, the Iowa Democratic Party experienced an unusually high volume of inbound phone calls to its caucus hotline," An Iowa Democratic Party official told NBC News.

"These included callers who would hang up immediately after being connected, supporters of President Trump who called to express their displeasure with the Democratic Party, and Iowans looking to confirm details for their evening’s caucus."

"Party staff and volunteers flagged and subsequently blocked repeat callers who appeared to be reaching out in an attempt to interfere with their reporting duties," the party official continued. "Veterans of past boiler room operations described the volume of calls as highly irregular compared to previous caucuses. The unexplained, and at times hostile, calls contributed to the delay in the Iowa Democratic Party’s collection of results, but in no way affected the integrity of information gathered or the accuracy of data sets reported."

Buttigieg's slim lead narrows with 97 percent reporting

Former Mayor Pete Buttigieg's slim lead over Sen. Bernie Sanders, I-Vt., narrowed early Thursday, according to the latest Iowa caucus results.

The candidates remain in the same positions with 97 percent of results reported — 1,711 out of 1,765 precincts. Sen. Elizabeth Warren is in third place, followed by former Vice President Joe Biden and Sen. Amy Klobuchar.

Buttigieg's narrow lead holds with 92 percent reporting

Former Mayor Pete Buttigieg continues to lead Sen. Bernie Sanders, I-Vt., in the latest batch of Iowa results, which was released by the state Democratic Party late Wednesday.

With 92 percent of the results reported, the candidates remain in the same positions. Sen. Elizabeth Warren is in the third place, followed by former Vice President Joe Biden and Sen. Amy Klobuchar.

Get the latest updates on the Iowa results.

Iowa caucus app was rushed and flawed from the beginning, experts say

The smartphone app that caused a significant delay in reporting Iowa caucuses results suffered from technical and design flaws, and appeared to have been rushed into use, according to cybersecurity experts who examined a version of the app that was made public.

The app became the subject of widespread scrutiny after the Iowa Democratic Party said problems with reporting caucus results were partially due to “coding issues” with the app, which was being used for the first time.

Developers who were able to look at a version of the app that was made public said it suffered from two problems. 

Read the story.

Corrected batch of results narrows Buttigieg's lead over Sanders

The corrected batch of Iowa caucus results released by the state Democratic Party on Wednesday night slightly narrowed former Mayor Pete Buttigieg's lead over Sen. Bernie Sanders, I-Vt.

With 86 percent of the results now reported, the candidates remain in the same positions, with Sen. Elizabeth Warren, D-Mass., in the third spot, followed by former Vice President Joe Biden in fourth and Sen. Amy Klobuchar, D-Minn., in fifth.

Iowa Dems to make 'minor correction' to last update, drawing ire of Sanders' camp

Still no change in candidates' positions with 85 percent of results reported

Former South Bend, Indiana, Mayor Pete Buttigieg remained in the lead in the Iowa caucus results after the state Democratic Party on Wednesday afternoon released its second update of the day.

With 85 percent of the results now reported, Sen. Bernie Sanders, I-Vt., remained in second place, followed by Sen. Elizabeth Warren, D-Mass., former Vice President Joe Biden and Sen. Amy Klobuchar, D-Minn.

The candidates' positions have remained the same since the state Democratic Party released initial results on Tuesday. 

After Iowa 'gut punch,' Biden sharpens criticism of Sanders and Buttigieg

After taking what he called a “gut punch” in the Iowa caucuses, former Vice President Joe Biden is taking a new approach in the final days leading up to the New Hampshire primary, calling out his opponents directly to argue that they are unqualified to be the Democratic nominee.

Biden unloaded on Sen. Bernie Sanders, I-Vt., and former South Bend, Indiana Mayor Pete Buttigieg at a rally here Wednesday in an effort to forcefully provide a reality check for voters by contrasting his electability and experience argument to the two Iowa caucus frontrunners.

Even though Biden has downplayed an apparent fourth place finish in the first-in-the-nation caucus state, his agitation for his loss has been on display since arriving in New Hampshire Tuesday, where he first began to directly call out Sanders by name.

But on Wednesday he went further than just criticizing Sanders’ Medicare-for-All position, pointing at the fact that vulnerable Democratic down-ballot candidates in red and blue states alike would have to defend Sanders’ far-reaching ideas, many of which Democrats have expressed skepticism about supporting.

Read the story.