A cache of more than 19,000 emails from Democratic party officials, leaked in advance of Hillary Clinton's nomination at the party's convention next week in Philadelphia, details the acrimonious split between the Democratic National Committee and Clinton's former rival, Senator Bernie Sanders.
Several emails posted by Wikileaks on its document disclosure website show DNC officials scoffing at Sanders and his supporters and in one instance, questioning his commitment to his Jewish religion.
Some emails also show DNC and White House officials mulling whether to invite guests with controversial backgrounds to Democratic party events.
Wikileaks did not disclose the identity of who provided the private material, those knowledgeable about the breach said last month that Russian hackers had penetrated the DNC computer system.
On its web page, Wikileaks said the new cache of emails came from the accounts of "seven key figures in the DNC" and warned that the release was "part one of our new Hillary Leaks series".
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Among the officials whose emails were made public were DNC spokesman Luis Miranda.
The emails include several stinging denunciations of Sanders and his organisation before and after the DNC briefly shut off his campaign's access to the party's key list of likely Democratic voters.
In mid-May emails with Miranda, his deputy, Mark Paustenbach, questioned whether the DNC should use the voter record furour to raise doubts about the Sanders campaign.
"Wondering if there's a good Bernie narrative for a story, which is that Bernie never had his act together, that his campaign was a mess," Paustenbach wrote.
Miranda spurned the idea, although he agreed with Paustenbach's take.
The same month, in another email to DNC officials, another official identified only as "Marshall" said of Sanders: "Does he believe in a God. He had skated on saying he has a Jewish heritage. I think I read he is an atheist. This could make several points difference with my peeps."
The Wikileaks releases also included exchanges between DNC officials and White House event planning officials about whether to allow several influential Democratic party donors to attend events where President Barack Obama and Michelle Obama were scheduled to appear.
One email exchange concerned whether to allow singer Ariana Grande to perform at a DNC event in the wake of an infamous online video that showed Grande licking other customers' doughnuts at a bakery in California.
DNC officials also worried about the singer's comment in the same video that "I hate America".
According to the emails, White House officials vetoed Grande's performance.
