Twitter whistleblower Peiter Zatko tells the US Congress that the platform ignored his security concerns, before its shareholders decide whether to approve a $44 billion takeover deal that Elon Musk is trying to exit. "To put it bluntly, Twitter leadership ignored its engineers because key parts of leadership lacked competency to understand the scope of the problem," Zatko, a hacker widely known as "Mudge" who was Twitter's former security chief, tells the hearing. "But more importantly, their executive incentives led them to prioritize profits over security." Twitter has dismissed 51-year-old Zatko's complaint as being without merit.