Chinese-owned social media site TikTok told U.S. senators it is working on a final agreement with the U.S. government that "will fully safeguard user data and U.S. national security interests," according to a letter seen Friday by Reuters.

TikTok Chief Executive Shou Zi Chew told senators in a letter dated Thursday the short video app was working with Oracle Corp on "new advanced data security controls that we hope to finalize in the near future." Last month, TikTok said it has completed migrating information on its U.S. users to servers at Oracle but it still is using U.S. and Singapore data centers for backup.

TikTok's letter acknowledged that China-based employees "can have access to TikTok U.S. user data subject to a series of robust cybersecurity controls and authorization approval protocols overseen by our U.S.-based security team." TikTok said as it continues to work on data issues it expects "to delete U.S. users protected data from our own systems and fully pivot to Oracle cloud servers located in the U.S."