Donald Trump’s presidential campaign is weighing whether to join TikTok, the wildly popular video app he once tried to ban, and the decision has sparked discussion among his advisers in recent weeks, according to four people familiar with the matter.

In 2020, the then-president said the app was a threat to national security because its parent company, ByteDance, is based in China, and he called for TikTok’s forced sale or a nationwide ban as part of an executive order that was ultimately overturned by the courts.