The Senate�s top Democrat is raising questions about the Transportation Security Administration�s use of the China-owned video app TikTok, citing potential national security concerns and a ban by the Department of Homeland Security.

Sen. Chuck Schumer raised the concerns in a letter Saturday to TSA Administrator David Pekoske, months after news reports that the U.S. government launched a national security review of the app, which is popular with millions of U.S. teens and young adults.

In his letter, Schumer said national security experts have raised concerns about TikTok�s collection and handling of user data and personal information, locations and other content. He also noted in the letter that Chinese laws compel companies to cooperate with China�s government and intelligence collection.

The New York Democrat also pointed to a Department of Homeland Security policy that prohibits TikTok on department-issued cellphones.

�Given the widely reported threats, the already-in-place agency bans, and the existing concerns posed by TikTok, the feds cannot continue to allow the TSA�s use of the platform to fly,� Schumer said in a statement to The Associated Press.

Over the last few months, the agency has posted a number of videos on TikTok � some of which have been re-shared on other social media platforms like Twitter and amassed hundreds of thousands of views.

Some of the videos are musical parodies about what can and can�t be brought on an aircraft, while others advertise services like TSA�s expedited screening program known as PreCheck. In one of the videos, a TSA spokeswoman with Nutella spread on her face is showing different containers of the chocolate-hazelnut spread to detail which one can be brought in carry-on luggage.

A spokesperson for the TSA did not immediately respond to an email seeking comment.

(AP)