Bryant also cautioned against a disruption in cross-border investment, as her company helps bring in investment from around the world, especially China.
WeChat users in the U.S. rushed to install the app before it could disappear from the app stores. They have also turned to QQ, as the ban did not specifically cover this product.
Some Chinese immigrants and expats worry losing access to the popular WeChat could cut off contact with family and friends in China.
It was unclear how the administration could implement the ban on WeChat in mid-September. It could order Apple Inc and Alphabet Inc's Google to remove WeChat from their app store, or order the apps to stop offering access or updates to U.S. users.