Sen. Bernie Sanders Bernie SandersSenate Republicans signal openness to working with Biden Hillicon Valley: DOJ indicts Chinese, Malaysian hackers accused of targeting over 100 organizations | GOP senators raise concerns over Oracle-TikTok deal | QAnon awareness jumps in new poll Schumer, Sanders call for Senate panel to address election security MORE (I-Vt.) slammed the process surrounding the Iowa caucuses while releasing his campaign's own internal data Tuesday amid growing anger and frustration over the delay of Monday night's results.

“This was not a good night for democracy," Sanders told reporters on a plane to New Hampshire.

Campaigns, volunteers and voters have grown furious at the delay in the results, which the Iowa Democratic Party has blamed on reporting issues and an issue with the phone app that was meant to transmit the final tallies.

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Sanders campaign senior adviser Jeff Weaver said on MSNBC Tuesday that the campaign's internal tallies show Sanders leading in the final count with 29.66 percent of the state's delegates. The data was based on 60 percent of the precincts reporting, he said. The campaign had released similar data based on 40 percent of precincts several hours earlier.

A number of other campaigns have also released their internal data from the caucuses, but the official results from the Iowa Democratic Party will not be available until 4 p.m. CT, according to the party's chairman.

The Sanders campaign's data showed former South Bend, Ind., Mayor Pete Buttigieg Pete ButtigiegBogeymen of the far left deserve a place in any Biden administration Overnight Defense: Woodward book causes new firestorm | Book says Trump lashed out at generals, told Woodward about secret weapons system | US withdrawing thousands of troops from Iraq A socially and environmentally just way to fight climate change MORE (D) in second place at 24.87 percent, followed by Sen. Elizabeth Warren Elizabeth WarrenNo new taxes for the ultra rich — fix bad tax policy instead Democrats back away from quick reversal of Trump tax cuts It's time for newspapers to stop endorsing presidential candidates MORE (D-Mass.) at 20.65 percent.

Former Vice President Joe Biden Joe BidenThe Memo: Warning signs flash for Trump on debates Senate Republicans signal openness to working with Biden National postal mail handlers union endorses Biden MORE placed fourth at 12.92 percent, while Sen. Amy Klobuchar Amy KlobucharEPA delivers win for ethanol industry angered by waivers to refiners It's time for newspapers to stop endorsing presidential candidates Biden marks anniversary of the Violence Against Women Act, knocks Trump and McConnell MORE (D-Minn.) rounded out the top six at 11.18 percent, according to the campaign's data.

The fallout over the delay in results in Iowa has raised questions over the legitimacy and viability of the caucuses.