Zuckerberg discussed TikTok specifically in meetings with several senators, according to people familiar with the meetings. In late October, Sen. Tom Cotton, R- Ark. — who met with Zuckerberg in September — and Sen. Charles Schumer, D-N.Y., wrote a letter to intelligence officials demanding an inquiry into TikTok. The government began a national-security review of the company soon after, and by the spring, Trump began threatening to ban the app entirely. This month he signed an executive order demanding that TikTok’s Chinese owner, ByteDance Ltd., divest itself of its U.S. operations.