Staffers from Joe Biden’s presidential campaign must remove TikTok from personal and work phones, a campaign official told the verge. That’s because of security concerns around the popular app.

Tiktok can access users’ clipboard content on iOS. The video-sharing app is owned by Chinese Internet company. Some politicians are particularly wary of TikTok.

The US Department of state and homeland security, the US Army, and the US Navy have already banned TikTok on government issued-devices. The US secretary of state Mike Pompeo said on July 6th that the White House was considering a ban on the social media app.

Wells Fargo has banned employees from using TikTok on company phones. Wells Fargo sent an email asking that employees remove TikTok from their phones on July 10th.