To save itself, TikTok in 2022 offered the U.S. government an extraordinary deal. The video app, owned by a Chinese company, said it would let federal officials pick its U.S. operation’s board of directors, would give the government veto power over each new hire and would pay an American company that contracts with the Defense Department to monitor its source code, according to a copy of the company’s proposal. It even offered to give federal officials a kill switch that would shut the app down