Alabama Attorney General Steve Marshall along with 20 other state attorneys general filed a brief urging the D.C. U.S. Court of Appeals to uphold the law that would force TikTok’s Chinese parent company to sell the app if it cannot find an American buyer within a year.

Marshall cited national security grounds as his reasoning for joining the brief.

“All users of TikTok must understand that every click, location, and recording is used as intelligence that we have ample reason to believe is available to the Chinese Communist Party. Americans asked for Congress to take action against this intrusion by a top foreign adversary, and Congress acted,” said Marshall. “We are urging the courts to uphold the lower court’s decision and enforce this critical national security law.”

The law being challenged was passed by Congress and signed by President Biden in April.

It would compel TikTok’s parent company, ByteDance, which has strong ties to the Chinese Communist Party, to sell the popular social media app to a U.S. firm within a year or have TikTok banned in America.

“TikTok is a valuable tool for conducting corporate and international espionage, and it may allow the Chinese Communist Party to track the real-time locations of public officials, journalists, and other individuals adverse to the Chinese Communist Party’s interests,” the attorneys generals said in the brief.

Besides Marshall, the attorneys general of Alaska, Arkansas, Florida, Georgia, Idaho, Indiana, Iowa, Kentucky, Louisiana, Mississippi, Missouri, Nebraska, New Hampshire, Oklahoma, South Carolina, South Dakota, Tennessee, and Utah also joined the brief led by Montana Attorney General Austin Knudsen and Virginia Attorney General Jason Miyares.