Biden supporters caucus in a Des Moines, Iowa, gym. Photo: Chip Somodevilla/Getty Images
Posters on 4chan, the anonymous message board famous as a gathering spot for trolls, shared the phone number of Iowa's Democratic caucus results line Monday evening and encouraged readers to "clog the lines," NBC News reports.
Why it matters: Technical problems with a results-tallying app led many Iowa precincts to try to report numbers by phone. The lines were already overloaded, but it now appears that malicious mischief might also have played a role.
One Democratic party official who helped man the phone line told colleagues he had received multiple calls to the line from Trump supporters who expressed "displeasure," Bloomberg reported Wednesday.
Go deeper: After Iowa, thinking smarter about election security