Musk expressed concern over that figure and said he'd look further into the matter.
"My offer was based on Twitter's [Securities & Exchange Commission] filings being accurate," he wrote, adding that Twitter CEO Parag Agrawal refused in a social post on Monday to prove that the share of phony accounts is less than 5%.
Elon and Maye Musk arrive for The Met Gala at The Metropolitan Museum of Art celebrating the Costume Institute opening of "In America: An Anthology of Fashion," in New York City on May 2. Photo by John Angelillo/UPI
Musk added in another tweet that he's still committed to buying Twitter, which has been a highly controversial deal. Twitter also said in a statement Tuesday that it's committed to the deal.
Some analysts have speculated that perhaps Musk is trying to lower the sale price due to the company's substantial loss in stock value in recent days. If Musk walked away from the deal, it's considered likely that it would cost him billions of dollars for breach of contract.
The deal does have a "reverse breakup fee," which would allow Musk to pay $1 billion to abandon the sale, but that would only apply if outside forces sank the deal -- such as a regulatory rejection or hidden fraud. Most experts don't believe that Musk would qualify for the reverse breakup provision.
Musk has said there's data that show the phony accounts on Twitter actually account for roughly 20% of monetizable daily active users.
Agrawai made his Twitter post on Monday to answer some of Musk's concerns. One said that "spam harms the experience for real people on Twitter, and therefore can harm our business."
"As such, we are strongly incentivized to detect and remove as much spam as we possibly can, every single day," he added. "Anyone who suggests otherwise is just wrong."