Twitter Gets One-Two Punch as Whistle-Blower Piles On After Musk

Twitter Inc. whistle-blower Peiter Zatko’s first public appearance since his explosive allegations against the social media giant couldn’t be more awkwardly timed for the company that billionaire Elon Musk no longer wants to buy.

Zatko, the ex-hacker who was Twitter’s head of security, is expected to tell the Senate Judiciary Committee on Tuesday that the company misled its board, investors and users about the security of its platform and the prevalence of bots.

The testimony comes as lawmakers and regulators seek to rein in or break up tech companies, and as Musk tries to get out of his offer ...