(CNN) Former South Bend, Indiana Mayor Pete Buttigieg declared victory in Monday night's Iowa caucuses before any official results were released by the Iowa Democratic Party.

"What a night. Because tonight, an improbable hope became an undeniable reality," Buttigieg told his supporters Monday night in Des Moines, Iowa.

The Iowa Democratic Party announced Monday that the reporting of caucus results was delayed because of "inconsistencies" in the reporting. The party has still not reported any results of the caucus.

"So we don't know all the results, but we know by the time, it's all said and done, Iowa you have shocked the nation. Because by all indications, we are going on to New Hampshire victorious," Buttigieg told the crowd in comments that drew criticism online.

Asked Tuesday by CNN's John Berman how he can claim victory without results, Buttigieg cited his campaign's internal data from the Iowa caucuses.

Read More