President Donald Trump has signed an executive order Monday to keep TikTok operating for 75 days, a relief to the social media platform’s users even as national security questions persist.

During his first term as president, Donald Trump led the effort to ban TikTok, the hugely popular video-sharing site he said posed threats to U.S. national security.

As the Taliban negotiates with senior politicians and government leaders following its lighting-fast takeover of Afghanistan, U.S. social media companies are reckoning with how to deal with a violent extremist group that is poised to rule a country of 40 million people.