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The whistle-blower’s complaints to the Securities and Exchange Commission, Justice Department and Federal Trade Commission come at a perilous time for Twitter.

The fast-food chain has wrestled with some shareholders and franchisees, as it faces the effects of inflation and weak economic growth.

Trading in the retailer’s stock was turbulent after an investor disclosed a 10 percent stake, then indicated he wanted the ability to sell out.

The billionaire entrepreneur said he wanted “to avoid an emergency sale of Tesla stock” if he was forced to complete the buyout of the social...

Elon Musk subpoenaed the banks advising Twitter in its deal, and Twitter sent subpoenas to several people close to Mr. Musk.

Twitter has sent out requests for information from the banks that are backing the billionaire’s purchase, which he is trying to walk away from.

Here are some of the company’s main legal arguments.

The billionaire behind it, Bill Ackman, said he was “unable to consummate a transaction that both meets our investment criteria and is executable.”

Mr. Musk has appeared reluctant to proceed with the $44 billion agreement, citing uncertainty about the number of fake accounts on the platform.